CBSE > Class 10 | CBSE Board | Homework Help

The nature of the roots depends on the value of b² – 4ac. bx² – 4ac is called the discriminant of the quadratic equation ax² + bx + c = 0 and is generally, denoted by D.
∴ D = b² – 4ac
If D > 0, i..e., b² – 4ac > 0, i.e., b2 – 4ac is positive; the roots are real and unequal. Also,
(i) If b² – 4ac is a perfect square, the roots are rational and unequal.
(ii) If b² – 4ac is positive but not perfect square, the roots are irrational and unequal.
If D = 0, i.e., b² – 4ac = 0; the roots are real and equal.
If D < 0, i.e., b2 – 4ac < 0; i.e., b² – 4ac is negative; the roots are not real, i.e., the roots are imaginary.

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Describe the preparations made by Mathilda for the ball. Why was she satisfild with her performance and presentation at the ball? Plese expelain it

Posted by Sonal Singh 5 years, 2 months ago

CBSE > Class 10 > English Language and Literature

0 answers

ANSWER

Nature of roots

Posted by Sachin Raj 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years, 1 month ago

Nature of Roots

A quadratic equation ax² + bx + c = 0 has

(i) two distinct real roots, if b² – 4ac > 0,

(ii) two equal real roots, if b² – 4ac = 0,

(iii) no real roots, if b² – 4ac < 0.

Since b² – 4ac determines whether the quadratic equation ax2 + bx + c = 0 has real roots or not, b² – 4ac is called the discriminant of this quadratic equation

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Sugam made up her mind to speak to me.The meaning of the phrase in the given sentence is ?

Posted by Sahil Narwani 5 years, 2 months ago

CBSE > Class 10 > Information Technology (402)

0 answers

ANSWER

आपको कुछ पैसो की जरूरत है;पेसै की मांग कराते हुये अपने पिताजी को एक पत्र लिखाए

Posted by Shrinithi B 5 years, 2 months ago

CBSE > Class 10 > हिंदी ब

2 answers

Sarthak Bandil 4 years, 11 months ago

Kyu likhu mein kudh kmata hu

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Gaurav Seth 5 years, 2 months ago

मीरा मॉडल स्कूल छात्रावास,
बी – 2ए जनकपुरी,
दिनांकः 29, 6, 2017

पूज्य पिताजी,

सादर चरण स्पर्श।

आपको यह जानकर अत्यंत प्रसन्नता होगी कि मैंने द्वितीय सैमिस्टर (सत्र) में प्रथम स्थान प्राप्त किया है। मुझे पूर्ण विश्वास है कि मुझे अगले सत्र में छात्रवृति भी अवश्य मिलेगी।

परन्तु इस समय मुझे आठ सौ रूपये की आवश्यकता आ पड़ी है। छुट्टियों में हम सब छात्रों ने मिलकर शिमला जाने का कार्यक्रम बनाया है। मेरा नाम भी भ्रमणार्थियों की सूची में शामिल है। इसलिए आप कृपया शीघ्र ही आठ सौ रूपये भिजवा दें।

आशा है आप अपना स्नेह बनाएं रखेंगे। माता जी को नमस्ते और रीतू को प्यार।

आपका प्रिय पुत्र,
रोहित

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ANSWER

Dueuw8d8wiir

Posted by Sachin Raj 5 years, 2 months ago

CBSE > Class 10 > Science

3 answers

Virender Singh 5 years, 2 months ago

Digestion

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Basamma.S. Naganagoudra Naganagoudra 5 years, 2 months ago

Don't no

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Abdul Qhadir Azhari Azhari 5 years, 2 months ago

Thanks sir

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Why is rainwater harvesting important

Posted by Sagar Rajput 5 years, 2 months ago

CBSE > Class 10 > Social Science

2 answers

Prince Bari 5 years, 2 months ago

Rainwater harvesting is important because: . It increases the water level . Used for other purposes like washing clothes, utensils, cleaning etc . Also used for washing car and bathing animals

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Gaurav Seth 5 years, 2 months ago

Water collected in ground does not evaporate, but spreads out to recharge wells and provides moisture for vegetation over a wide area.
The groundwater is also relatively protected from contamination by human and animal waste.
It provides year round supply of drinking water.
It does not provide breeding grounds for mosquitoes like stagnant water collected in ponds or artificial lakes.

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why was it important for Mrs pumphrey to be a little cruel in order to be kind towards tricky?

Posted by Rishika Kundu 5 years, 2 months ago

CBSE > Class 10 > English Language and Literature

3 answers

Rishika Kundu 5 years, 2 months ago

Thanks to both of you

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Raj Wardhan 5 years, 2 months ago

Excess of everything is bad. Mrs. Pumphrey pampered trickie too much. She was an exceedingly pampering woman; her pampering spoilt her pet dog, Tricki. She had provided all types of facilities to the dog such as day bed, night bed, favourite cushions, toys and rubber rings, breakfast bowl, lunch bowl, supper bowl, etc. In her love for him, she let him overeat; she did not make him do exercise. As a result Tricki became exceedingly fat. His health suffered. He had to be admitted to James Herriot’s clinic where he treated him by not giving him much to eat and making him do lots of physical exercise.

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Gaurav Seth 4 years, 6 months ago

As a result Tricki became exceedingly fat. His health suffered. He had to be admitted to James Herriot’s clinic where he treated him by not giving him much to eat and making him do lots of physical exercise.

2Thank You

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How did Peggy justify her cruel behavior towards Wanda

Posted by Rishika Kundu 5 years, 2 months ago

CBSE > Class 10 > English Language and Literature

5 answers

Vinay Kumar Aditya 4 years, 11 months ago

राष्ट्र के प्रति हमारा क्या कर्तव्य है? क) राष्ट्र को स्वावलंबी बनाएँ। ख) राष्ट्र की प्रगति में पूरा-पूरा सहयोग दें। ग) उद्योग स्थापित करें। घ) राष्ट्र को प्रगतिशील एवं स्वावलंबी बनाएँ।

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Mahi Jain 5 years, 1 month ago

how did Peggy justify Her cruel behavior towards wanda

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Heer Dand 5 years, 1 month ago

She was finding excuses to justify her behavior towards Wanda. She said that they could do nothing then as Wanda had left already. Giving an excuse for her irrational conduct, she advocated that by asking Wanda about all her dresses, she had urged her to get good ideas for her drawings. Even when Wanda had left the school she was giving excuse for her mistake by saying that she had never made her cry.

2Thank You

Yashveer Singh 5 years ago

Because she doesn't have 100 dresses then also she pretend to have 100 dresses all lined up in her closet

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Yogita Ingle 5 years, 1 month ago

4Thank You

ANSWER

Class 10 exercise 8.4 ques 5

Posted by S S 5 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Gaurav Seth 5 years, 2 months ago

(i) (cosec θ – cot θ)²= (1-cos θ)/(1+cos θ)

To prove this, first take the Left-Hand side (L.H.S) of the given equation, to prove the Right Hand Side (R.H.S)

L.H.S. = (cosec θ – cot θ)²

The above equation is in the form of (a-b)², and expand it

Since (a-b)² = a² + b² – 2ab

Here a = cosec θ and b = cot θ

= (cosec²θ + cot²θ – 2cosec θ cot θ)

Now, apply the corresponding inverse functions and equivalent ratios to simplify

= (1/sin²θ + cos²θ/sin²θ – 2cos θ/sin²θ)

= (1 + cos²θ – 2cos θ)/(1 – cos²θ)

= (1-cos θ)²/(1 – cosθ)(1+cos θ)

= (1-cos θ)/(1+cos θ) = R.H.S.

Therefore, (cosec θ – cot θ)²= (1-cos θ)/(1+cos θ)

Hence proved.

(ii) (cos A/(1+sin A)) + ((1+sin A)/cos A) = 2 sec A

Now, take the L.H.S of the given equation.

L.H.S. = (cos A/(1+sin A)) + ((1+sin A)/cos A)

= [cos²A + (1+sin A)²]/(1+sin A)cos A

= (cos²A + sin²A + 1 + 2sin A)/(1+sin A) cos A

Since cos²A + sin²A = 1, we can write it as

= (1 + 1 + 2sin A)/(1+sin A) cos A

= (2+ 2sin A)/(1+sin A)cos A

= 2(1+sin A)/(1+sin A)cos A

= 2/cos A = 2 sec A = R.H.S.

L.H.S. = R.H.S.

(cos A/(1+sin A)) + ((1+sin A)/cos A) = 2 sec A

Hence proved.

For more click on the given link:

<a href="https://mycbseguide.com/blog/ncert-solutions-class-10-maths-exercise-8-4/" ping="/url?sa=t&source=web&rct=j&url=https://mycbseguide.com/blog/ncert-solutions-class-10-maths-exercise-8-4/&ved=2ahUKEwiAh6LGlLPsAhWhQ3wKHRY_BY0QFjADegQIAhAC" rel="noopener" target="_blank">NCERT Solutions for Class 10 Maths Exercise 8.4 ...</a>

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Patel Sangita 5 years, 2 months ago

Yes

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Kirti Deshwal 5 years, 2 months ago

We have to solve all parts of question 5

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The length of a chain used as boundary of the semi circular park is 90cm .Find the area of the park

Posted by Wanpynbiang Wansit 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 5 years, 2 months ago

Length of the boundary of the semicircular park = 90 m
⇒ πr + 2r = 90
⇒ r(22/7 + 2) = 90
⇒ r = (90*7)/36
⇒ r = 17.5 m
Area of the semicircular park = 1/2πr²
= 1/2*22/7*17.5*17.5
= 481.25 sq m

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ANSWER

Define credite

Posted by Payal Sharma 5 years, 2 months ago

CBSE > Class 10 > Social Science

1 answers

Yogita Ingle 5 years, 2 months ago

The Credit refers to an agreement under which goods and services, or money is exchanged against a promise to pay later. This agreement is largely based on trust.

Another definition of Credit refers to the money given by banks to its customer and the later has to pay it on time. If he fails to pay the same on time, he will be charged by the bank.

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ANSWER

Imagine yourself as the playwright of the play. Based on your understanding of the personality traits of Natalya and Ivan, write a dialogue based on an imaginary event, show- casing another argument between them.

Posted by Good Student 5 years, 2 months ago

CBSE > Class 10 > English Language and Literature

0 answers

ANSWER

Read the following quote by an American author, E. E. Hale. “I am only one but, I am one. I cannot do everything but I can do something. And I will not let what I cannot do interfere with what I do.” Bholi’s evolution from a ‘dumb cow’ to a ‘masterpiece’ supports the given quote. Justify

Posted by Good Student 5 years, 2 months ago

CBSE > Class 10 > English Language and Literature

2 answers

Hardik Gupta 5 years ago

The quotation by the American author focuses at one point. It is that one can achieveheights and will achieve heights of success if one determines. All are not born great. Butthey achieve greatness through hard work, perservance, courage, forbearance and patience.However, they need guidance and moral support. Bholi’s evolution from a ‘dumb cow’ to a‘masterpiece’ support this. Before Bholi is sent to school she is ridiculed by all. Even herparents, sisters do not have a soft corner for her. They also discourage her in many ways.Her father has no hope for her and her mother equally treats her not mother-like. Buteducation and her teacher’s moral support make Bholi a masterpiece. She opposes theinappropriate match of her with Bishamber. He demands money as dowry. But he is shownthe way out. Bholi is now a courageous, self-respecting and morally-sound woman whocan face the world all alone. She, therefore, proves the essence of the quote of the Americanauthor.

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Hardik Gupta 5 years ago

Dumb cow---- people’s perception of her lack of sense, stammering which kept her quiet and submissive demeanour, most of the times - Going to school----guidance of the teacher and education, overcame stammering- instilled confidence and a sense of self-esteem - Did not succumb to the greedy demands of the prospective groom and spoke out. Conclusion: This journey of Bholi’s growth clearly showcases the idea of being an individual and not being exploited by people or circumstances. Instead, evolves to being a person being proactive and contributing to the wellbeing of others around

1Thank You

ANSWER

Two Pink coloured flower on crossing resulted in 1red 2pink n 1white flower progeny. The nature of Cross Will be

Posted by Urvashi Urvashi 5 years, 2 months ago

CBSE > Class 10 > Science

3 answers

Basamma.S. Naganagoudra Naganagoudra 5 years, 2 months ago

I don't no

1Thank You

Abdul Qhadir Azhari Azhari 5 years, 2 months ago

Thanks sir

0Thank You

Urvashi Urvashi 5 years, 2 months ago

Self pollinarion

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ANSWER

कवि के अनुसार बादल किससे और कब शांति देता है

Posted by Aditya Kumar 5 years, 2 months ago

CBSE > Class 10 > हिंदी ए

1 answers

Aziz Fatima 5 years, 1 month ago

कवी के अनुसार बादल धरती तथा उसके लोगो को झुलसा देने वाली गर्मी में पानी बरसा के शांति देता है.....

1Thank You

ANSWER

which property of metal help molding it into different shapes?

Posted by Abhishesh Paswan 5 years, 2 months ago

CBSE > Class 10 > Science

5 answers

Abdul Qhadir Azhari Azhari 5 years, 2 months ago

Thanks sir

1Thank You

Arun Arun 5 years, 2 months ago

Poda

2Thank You

Kirti Deshwal 5 years, 2 months ago

Elasticity is the answer of this question

2Thank You

Yogita Ingle 5 years, 2 months ago

Elasticity is the property of metal which helps in molding it into different shapes

2Thank You

Ankita Mahalik 5 years, 2 months ago

Ductility and malleability both

2Thank You

ANSWER

How was Wanda seen as different by the other girls?

Posted by Adarsh Patel 5 years, 2 months ago

CBSE > Class 10 > English Language and Literature

2 answers

Rajan Singh 5 years, 2 months ago

Wanda was seen as different from other girls because she always use and to wear the same pale blue coloured dress and she belongs from boggins height and she always use to sit away from other girls and having a funny name petronski

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Meenakshi Jamini 5 years, 2 months ago

Wanda petronski was a unbeautiful girl .she belongs to a poor family.she live in buggin hieghts.she always wore the same faded blue colour dress .she sit in a corner in the class .she have no friends and she did not talk to anyone in the school .her name was also different from other girls.everyone make fun of her but she did not say anything to them . Above mentioned are the some points by which Wanda petronski was different from other girls.

2Thank You

ANSWER

What is secant?

Posted by Harchitha Narayanan 5 years, 2 months ago

CBSE > Class 10 > Mathematics

4 answers

Navnoor Singh 5 years, 2 months ago

Secant is a line which touches the circle at two points

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Jaat Shab 5 years, 2 months ago

Secant is a line that touces the circle at two points.

2Thank You

Harchitha Narayanan 5 years, 2 months ago

a line that intersects the curve at a minimum of two distinct points. The word secant comes from the Latin word secare, meaning to cut. In the case of a circle, a secant will intersect the circle at exactly two points.

1Thank You

Deborpita Saha 5 years, 2 months ago

Secant is a line that touces the circle at two points.

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ANSWER

A well a daimeter 3 m is dug 14 m deepthe earth taken downit has been spread evenly all around in a safe is circular ring of white women kurta to form a embarrassed made find the height of

Posted by Arushi Agrahari 5 years, 2 months ago

CBSE > Class 10 > Mathematics

1 answers

Gaurav Seth 5 years, 2 months ago

Height of the well = 14 m
Diameter of the well = 3 m
So, Radius of the well = 3/2 m
Volume of the earth taken out of the well = πr²h
= 22/7*(3/2)²*14
= 99 cu m
Outer radius of the embankment = R = (3/2 + 4)m = 11/2 m
Area of embankment = outer area - inner area
⇒ = πR² - πr²
= 22/7*[(11/2)² - (3/2)²]
= 22/7*[(121/4) - (9/4)]
= 22/7 × 112/4
= 88 m²
Height of the embankment = Volume/Area
= 99/88
Height of the embankment = 1.125 m

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ANSWER

Q. भारत जैसे देश के लिए विकेंद्रीकरण की नीति आवश्यक था। स्पष्ट करें?

Posted by Rohit Kumar 5 years, 2 months ago

CBSE > Class 10 > सामाजिक विज्ञान

1 answers

Gaurav Seth 5 years ago

जब सत्ता केंद्र और राज्य सरकारों से छीन ली जाती है, और स्थानीय सरकारों को दी जाती है, तो इसे विकेंद्रीकरण कहा जाता है।
(i) विकेंद्रीकरण के पीछे मूल विचार यह है कि बड़ी संख्या में समस्याएं और मुद्दे हैं जो स्थानीय स्तर पर सबसे अच्छे ढंग से सुलझाए जाते हैं। लोगों को अपने इलाकों में समस्याओं का बेहतर ज्ञान है। उनके पास बेहतर विचार भी हैं कि पैसा कहाँ खर्च करना है, और चीजों को अधिक कुशलता से कैसे प्रबंधित करना है।
(ii) स्थानीय स्तर पर, लोगों के लिए निर्णय लेने, बनाने में सीधे भाग लेना संभव है। यह लोकतांत्रिक भागीदारी की आदत को विकसित करने में मदद करता है। मूल रूप से स्थानीय सरकार लोकतंत्र के एक महत्वपूर्ण सिद्धांत को महसूस करने का सबसे अच्छा तरीका है, अर्थात् स्थानीय स्व-सरकार।

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ANSWER

Pls define power of a lens in simple words and refractive index of media

Posted by Rajan Singh 5 years, 2 months ago

CBSE > Class 10 > Science

4 answers

Basamma.S. Naganagoudra Naganagoudra 5 years, 2 months ago

Iyyos6ie6e7eudjxju☺☺???????☺??☺?☺??????☺?☺??☺??☺

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Abdul Qhadir Azhari Azhari 5 years, 2 months ago

Thanks sir

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Rajan Singh 5 years, 2 months ago

Thanx bhai

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Gaurav Seth 5 years, 2 months ago

Power of a lens

Power of a lens is the ability to converge or diverge the ray of light falling on it.

Power of a lens is defined as reciprocal of focal length of the lens.

P=—–

A lens of small focal length has large power of converging or diverging a parallel beam of light.

Unit of power is Diopter (D)

1Thank You

ANSWER

Mere priy shikshak pr nibandh

Posted by Toni Bleyar Maurya 5 years, 2 months ago

CBSE > Class 10 > हिंदी ए

2 answers

Toni Bleyar Maurya 5 years, 2 months ago

Hath se????typing krke

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Sangam Kumar 5 years, 2 months ago

Poora nibandh kaise likhe batao

3Thank You

ANSWER

Give a brief sketch of meggi.

Posted by Prabjyot Śingh 5 years, 2 months ago

CBSE > Class 10 > English Language and Literature

2 answers

Gaurav Seth 5 years, 2 months ago

Margie Jones is an eleven year old girl. She is taught by a mechanical teacher in her home . She uses to write her feelings in a diary. She too writes about finding a . She's having a little knowledge about the old schools and teachers. She collected all the information from her friend Tommy and her grandfather.

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Meenakshi Jamini 5 years, 2 months ago

Maddie was a friend of Peggi.She belongs to a poor family .Her mother works at home of peg. Peggy 's mother gave her old clothes of peg and she always wore old clothes of Peggi.the main difference between Maddie and Wanda petronski was that Maddie's name was not such bad like Wanda and she did not live in buggin hieghts. Maddie was a good friend of peegy.she always stey in school with paggy and she also make fun of Wanda petronski as Peggy could . Maddie did not feel good about this fun but she had to support Peggy due to Peggy's richness .She felt guilty when Wanda petronski left the area and school and go to New place and school .

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ANSWER