Solution of sum 2 ex. 4.3 - It can be observed that point ( 2 , 14 ) satisfies the equation 7x - y = 0 and x - y + 12 =0 . Therefore , 7x - y = 0 and x - y + 12 = 0 are two lines passing through point ( 2 , 14 ) . As it is known that through one point , infinite number of lines can pass through , therefore , there are infinite lines of such type passing through the given point

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Round off the nearest tens of 387.6

Posted by Roshani Pal 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 5 years, 4 months ago

Round off the nearest tens of 387.6 = 388

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Rationalise:1/root 6-root 7

Posted by Sangeeth Manoj Kumar R 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Surjeet Mohanty 5 years, 4 months ago

1/√6-√7=1/√6-√7×√6+√7/√6+√7=√6+√7/(√6)^2-(√7)^2=√6+√7/6-7=√6+√7/-1

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Navinchal received a white card board cube of side 0.5 m. He did not like the raw cube and decided to put the blue stars on the surfaces, without folding. Area of each star is 40 cm² . Calculate the area of the remaining if he put 372 blue stars in total on the surface.

Posted by Harshitha Mohan 4 years, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

How will you describe the position of a table lamp on your study table to another person?

Posted by Devansh Dixit 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 5 years, 4 months ago

To describe the position of a table lamp placed on the table, let us consider the table lamp as P and the table as a plane. Now choose two perpendicular edge of the table as the axes OX and OY. Measure the perpendicular distance ‘a’ cm of the lamp from OY. Measure the perpendicular distance ‘b’ cm of P (lamp) from OX.

Thus, the position of the table lamp P is described by the ordered pair (a, b).

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Solution- (2+√3)(2+√2)(3+√3)(3-√3)

Posted by Mukesh Kumar 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Lakshya Sharma 5 years, 4 months ago

Se*

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What would be the denominator after rationalizing 7/(5√3 - 5√2)?

Posted by Bhawna Saxena 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 5 years, 4 months ago

7 / (5√3-5√2)

= 7 (5√3+5√2)/ (5√3-5√2) * (5√3+5√2) /

=7(5√3+5√2) / (5√3)²-(5√2)²

=35√3+35√2 / 75-50

=35√3+35√2 / 25

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Write three irrational numbers between 2/7 and 2 / 5

Posted by Aarushi Somani 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 3 months ago

take LCM of 7 and 5
LCM is 35
then multiply 2 / 7 with such a number so that we could get 35 that is 2 / 7 *5= 10/35
multiply 2/5 to get 35 that is 2 / 5 into 7 equals to 14 upon 35
so we will have to find the numbers between 10 / 35 and 14 / 35
show the numbers are 11/35 12/35 13/35
we could get three numbers only but the question is we need five rational numbers
so we will multiply the LCM with two that is 70 70 also comes in Table of 7 and 5
then multiply 2/7 with 10 to get 20/70
multiply 2/5 with 14 to get 28 / 70
so now we get so many rational numbers between these two these are as follows 21 / 70 22 / 70 23 / 70 24/70 25/70 26 / 70 and so on

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Chapter 6 Exercise 6.1

Posted by Bhawana Mali 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 3 months ago

1. In Fig. 6.13, lines AB and CD intersect at O. If AOC +BOE = 70° and BOD = 40°, find BOE and reflex COE.

Solution:

From the diagram, we have

(AOC +BOE +COE) and (COE +BOD +BOE) forms a straight line.

So, AOC+BOE +COE = COE +BOD+BOE = 180°

Now, by putting the values of AOC+BOE = 70° and BOD = 40° we get

COE = 110° and

BOE = 30°

For more click:

<a href="https://mycbseguide.com/blog/ncert-solutions-for-class-9-maths-exercise-6-1/" ping="/url?sa=t&source=web&rct=j&url=https://mycbseguide.com/blog/ncert-solutions-for-class-9-maths-exercise-6-1/&ved=2ahUKEwiWrY2woPLsAhWLwjgGHZVtARIQFjAAegQIBBAC" rel="noopener" target="_blank">NCERT Solutions for Class 9 Maths Exercise 6.1 ...</a>

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To find centroid of a acute angle triangle, obtuse angle triangle and right angle triangle...

Posted by Easha Sahu 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Bhawana Mali 5 years, 4 months ago

Fjsiw

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How many integer no. between 1and10 are prime

Posted by Parvinder Rajput 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Mohammed Abdullah 5 years, 4 months ago

2,3,5,7

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In triangle ABC inwhich angle A = 70°find angle b and angla c

Posted by Gobind Kumar 5 years, 4 months ago

CBSE > Class 09 > Mathematics

2 answers

Surjeet Mohanty 5 years, 4 months ago

Angle b =55° and Angle c =55°

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Surjeet Mohanty 5 years, 4 months ago

Angle b =55° and Angle c =55°

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2x²-7x+6

Posted by Deepankar Sharma 5 years, 4 months ago

CBSE > Class 09 > Mathematics

2 answers

Yogita Ingle 5 years, 4 months ago

2x²-7x+6

= 2x²-4x -3x+6

= 2x ( x - 2) - 3 ( x - 2)

= (2x - 3) (x - 2)

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Mandozai Abbas Khan 5 years, 4 months ago

2x²-6x-x+6

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AB IS A LINE SEGMENT AND P IS ITS MID POINT

Posted by Sarthak Purohit 5 years, 4 months ago

CBSE > Class 09 > Mathematics

2 answers

Aditi Kumari 5 years, 4 months ago

Hello

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Roshan Sahani 5 years, 4 months ago

Yes I know but what is the question

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Show that the angles of an equilateral triangle are 60 degree each.

Posted by Aadarsh Kumar 5 years, 4 months ago

CBSE > Class 09 > Mathematics

2 answers

Surjeet Mohanty 5 years, 4 months ago

By angle sum property we know that the sum of all the angles of a triangle is 180° We know that all the sides of a triangle are equal. i.e all the angles of an equilateral triangle are equal. Let each angle be x. x + x + x = 180° 3x = 180° ⇒x = 60° Hence, we proved that all angle of a equilateral angle is 60°

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Yogita Ingle 5 years, 4 months ago

By angle sum property we know that the sum of all the angles of a triangle is 180⁰

We know that all the sides of a triangle are equal.

i.e all the angles of an equilateral triangle are equal.

Let each angle be x.

x + x + x = 180⁰

3x = 180⁰

⇒x = 60⁰

Hence the answe

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explain wavey curve method

Posted by Gowtham Sai Venkat Kavuru 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 3 months ago

WAVY CURVE METHOD

inequalities

If p, q and r are real numbers, then

and
and equality holds for a = 1
and equality holds for a = –1

Inequation Involving Exponential Expression:

If k > 0, then kx > 0 for all real x.
If k > 1, then kx > 1, when x > 0
If 0 < k < 1, then kx < 1, when x > 0 and kx > 1, when x < 0.

How to solve inequalities by wavy curve method

In order to solve the inequalities of the form

where n₁, n₂, ……. , n k , m1, m₂, ……. , mp are real numbers and a₁, a₂, ……. , a_k, b₁, b₂, ……., bp are any real number such that ai ≠ bj where i = 1, 2, 3, ….k and j = 1, 2, 3, ….p.

Method:

Step - 1→ First arrange all values of x at which either numerator or denominator is becomes zero, that means a1, a2,….., ak, b1, b2, ….bp in increasing order say c1, c2, c3,……. cp + k. Plot them on real line

Step -2 → Value of x at which numerator becomes zero should be marked with dark circles.

Step - 3 → All pints of discontinuities (x at which denominator becomes zero) should be marked on number line with empty circles. Check the value of ƒ(x) for any real number greater than the right most marked number on the number line.

Step - 4 → From right to left draw a wavy curve (beginnings above the number line in case of value of ƒ(x) is positive in step–3 otherwise from below the number line), passing thoroughly all the marked points. So that when passes through a point (exponent whose corresponds factor is odd) intersects the number line, and when passing thoroughly a point (exponent whose corresponds factor is even) the curve doesn’t intersect the real line and remain on the same side of real line.

Step - 5 → The appropriate intervals are chosen in accordance with the sign of inequality (the function ƒ(x) is positive wherever the curve is above the number line, it is negative if the curve is found below the number line). Their union represents the Detail Explanation of inequality

Example : Let

Detail Explanation :

Step - 1 → make on real line all x at which numerator becomes zero with dark circles.

Step - 2 → mark point of discontinuity (value of x at which denominator becomes zero) with empty circles

Step - 3 → Check ƒ(x) for x > 7, ƒ(8) > 0

Exponents of factors of –1, 3, 4 is even, hence wave will not change the direction at these points.

Hence

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ex1. 2

Posted by Lalruatzeli Cvanlalruatzeli 5 years, 4 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 3 months ago

1. State whether the following statements are true or false. Justify your answers.

(i) Every irrational number is a real number.

Solution:

True

Irrational Numbers – A number is said to be irrational, if it cannot be written in the p/q, where p and q are integers and q ≠ 0.

i.e., Irrational numbers = ‎π, e, √3, 5+√2, 6.23146…. , 0.101001001000….

Real numbers – The collection of both rational and irrational numbers are known as real numbers.

i.e., Real numbers = √2, √5, 0.102…

Every irrational number is a real number, however, every real numbers are not irrational numbers.

For more click on the given link:

<a href="https://mycbseguide.com/blog/ncert-solutions-class-9-maths-exercise-1-2/" ping="/url?sa=t&source=web&rct=j&url=https://mycbseguide.com/blog/ncert-solutions-class-9-maths-exercise-1-2/&ved=2ahUKEwjL18TnpPLsAhWswjgGHWopB_YQFjADegQIBBAC" rel="noopener" target="_blank">NCERT Solutions for Class 9 Maths Exercise 1.2 ...</a>

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9 th class syllabus

Posted by Rishi Passi 5 years, 4 months ago

CBSE > Class 09 > Mathematics

2 answers

Rishi Passi 5 years, 4 months ago

Thanks ??????

1Thank You

Gaurav Seth 5 years, 4 months ago

HRD Minister Ramesh Nishank announced a major CBSE syllabus reduction for the new academic year 2020-21 on July 7 which was soon followed by an official notification by CBSE on the same.

Considering the loss of classroom teaching time due to the Covid-19 pandemic and lockdown, CBSE reduced the syllabus of classes 9 to 12 with the help of suggestions from NCERT.

Click on the given links:

<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Main-Secondary/REVISEDMathematics_Sec_2020-21.pdf" target="_blank">REVISED - Mathematics</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Main-Secondary/REVISEDScience_Sec_2020-21.pdf" target="_blank">REVISED - Science</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Main-Secondary/REVISEDSocial_Science_Sec_2020-21.pdf" target="_blank">REVISED - Social Science</a>

For deleted topics :

<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDComputer_Application_Sec_2020-21.pdf" target="_blank">Deleted - Computer Application</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDEnglish_Sec_2020-21.pdf" target="_blank">Deleted - English - Language and Literature</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDHindi_A_Sec_2020-21.pdf" target="_blank">Deleted - Hindi A</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDHindi_B_Sec_2020-21.pdf" target="_blank">Deleted - Hindi B</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDHome_Science_Sec_2020-21.pdf" target="_blank">Deleted - Home Science</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDMathematics_Sec_2020-21.pdf" target="_blank">Deleted - Mathematics</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDScience_Sec_2020-21.pdf" target="_blank">Deleted - Science</a>
<a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDSocial_Science_Sec_2020-21.pdf" target="_blank">Deleted - Social Science</a>

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3x 2x 5x are the angle find the value of x

Posted by Aditya Yadav 5 years, 4 months ago

CBSE > Class 09 > Mathematics