CBSE > Class 10 > Mathematics | CBSE Board | Homework Help

If α and β are the zeros of the quadratic polynomial f(x)=ax2+bx+c, then evaluate α−β sum of zeros =α+β=a−b product of zero =αβ=ac Moreover, we have (α−β)2=(α+β)2−4αβ a2b2−a2c2 ⇒ α−β=a±b2−c2

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How many terms of the arithmetic progression 45,39,33.....must be taken so that aum is 180?explain the double answer.

Posted by Vanshika Singh 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Vikhyat Wahi 3 years, 6 months ago

Sn = 180 n/2 [90 + (n - 1)(-6)] = 180 90n – 6n2 + 6n = 360 ⇒ 6n2 – 96n + 360 = 0 ⇒ 6[(n – 6)(n – 10)] = 0 ⇒ n = 6, n = 10 Sum of a7, a8, a9, a10 = 0 ∴ n = 6 or n = 10

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Determine the ap whose third term is 16 and 7th term exceeds the 5th term by 12

Posted by Devasena Bala 3 years, 6 months ago

CBSE > Class 10 > Mathematics

2 answers

Megha Soni 3 years, 6 months ago

A3 = 16 A7 - A5 =12 A+6d -A+4d =12 By elimination:- 2d =12 D = 12/2 D=6 answer Hope it helps.....

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Pragathi K.V. 3 years, 6 months ago

A3 = 16 A7 - A5 = 12

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Some on send the importance question ❓❓

Posted by Saniya Khan 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Megha Soni 3 years, 6 months ago

Value of k square. Roots of equation by quadratic formula. SN An Volume of shapes TSA of shapes Mode Case study may be formed from chapters 9 and 13. Tangent prove Median. These are the questions which were also discussed in the video by dear sir. I am providing you the link of the YouTube channel https://youtube.com/c/DearSir

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Some on send the importance formula in maths basic term 2

Posted by Saniya Khan 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Vikhyat Wahi 3 years, 6 months ago

All formula's given in the all chapters are important, Mainly all AP formula and Statistics

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Solve - 2^2x+3-65(2^x+1)=57 find x.

Posted by Nitish Kumar 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Vedant Suryawanshi 3 years, 6 months ago

-0.94

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How to find the middle term when n is even

Posted by Karthik Vivek 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Mukunth P 3 years, 6 months ago

(n/2)th and( n/2+1)th observation

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For a positive integer n, prove that nx3 - n is divisible by 6

Posted by Gourav Malik 3 years, 6 months ago

CBSE > Class 10 > Mathematics

0 answers

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Three cube same dimensions find the surface area of cube

Posted by Vipin Nagar 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Megha Soni 3 years, 6 months ago

The surface area of the cube is 6a square. Let the dimension of one cube be a=2 Then the surface area of one cube will be 24cm. If we talk about the surface area of three cubes together then it will be 24+ 24 +24= 72 cm all together. 72 cm is the required answer to this question. Hope it helps

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Vikram wishes to fit three rods together

Posted by Vansh Malhotra 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Megha Soni 3 years, 6 months ago

So? Apna question complete likha kro ya phir uski pic dal diya karo.

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Excersise no 5.1 question no 4 which of the following are ap 2,4,8,16

Posted by Saanvi Saxena 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Ravjot Kaur 3 years, 6 months ago

AP : 2,4,8,16 is not in ap Because the difference is not common D=4-2=2 D=8-4=4 D=16-8=8

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2x+5y=2 2x+3y=3 Find the value of X,y

Posted by Pratima Patel 3 years, 6 months ago

CBSE > Class 10 > Mathematics

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Factorize (a+b)2

Posted by Yursem Zimik 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Vedant Suryawanshi 3 years, 6 months ago

asquare +2ab+ bsquare

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Show that reciprocal of 3+2√2 is irrational

Posted by Ananya Pattanaik 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Aparna Bhamare 3 years, 6 months ago

let 1/3+3√2 be a rational number 1/3+3√2 = a/b [ where b is not equal to zero] Rationalize the denominator, 1/3+3√2= 3-3√2 / 3-3√2 = 3-3√2/ (3)² - (3√2)² -(3-3√2)/ 9 = a/b -3 + 3√2 = 9a/b 3√2 = 9a+ 3b/b √2 = 9a + 3b/3b we know that √2 is irrational Irrational is not equal to rational . therefore, 1/3+3√2 is irrational Hope that my answer helps...

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Amit standing on a horizontal plane finds a bird flying at a distance of 200 m from him at an elevation of 30 degree Depak standing on the roof of a 50 M high building find the angle of elevation of the same but to be 45 and Deepak iron opposite sides of a bird find the distance of the bird from Deepak

Posted by Neha Preethi 3 years, 6 months ago

CBSE > Class 10 > Mathematics

0 answers

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X^-60x_270=0 find its factors

Posted by Divya Sharma 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Madhuparna Saha 3 years, 6 months ago

90 and -30

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Formula of sum of zero

Posted by Ayushman Singh 3 years, 6 months ago

CBSE > Class 10 > Mathematics

2 answers

Tanishq Pratap Chauhan 3 years, 6 months ago

- coefficient of x/ coefficient of x²

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Ayushman Singh 3 years, 6 months ago

-B/A

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The nth term of a sequence is 3n-2n. Find the sum of first 15 term.

Posted by Sourav Dagar 3 years, 6 months ago

CBSE > Class 10 > Mathematics

4 answers

Aryan Mandloi 3 years, 6 months ago

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Muskan Sharma 3 years, 6 months ago

an = 3n-2n =} a1 = 3(1)-2(1) =} a = 1 =} Similarly, a2 = 2 , a3 = 3 =} AP = 1,2,3,.... =} Sn = n/2[2a+(n-1)d] =} 15/2[2(1)+(15-1)1] =} 120

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Nivetha .A 3 years, 6 months ago

120

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Dheeraj Agarwal 3 years, 6 months ago

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Solve by elimination method 3x +4y = 10 2x - 2y = 2

Posted by Siddhi Bhondave 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Dheeraj Agarwal 3 years, 6 months ago

x=10-4y ÷ 3 x=2+2y ÷2 this equation and then solve

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The length and breadth of a rectangular hall are 30 M and 27 M respectively. determine the maximum length of a rope that can measure the length and breadth of the room exact number of times.

Posted by Sayan Khandre 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Himan J 3 years, 6 months ago

30=2*3*5 27=3*3*3 HCF(30,27)=3 Ans:3m

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find hcf of 399 and 1059 by applying Euclid's division leema

Posted by Ankitha Sangogli 3 years, 6 months ago

CBSE > Class 10 > Mathematics

2 answers

Vedant Suryawanshi 3 years, 6 months ago

1)1059=2*399+261 2)399=1*261+138 3)261=1*138+123 4)138=1*123+15 5)123=15*8+3 6) 15=3*5+0 °° HCF(1059,399)=15

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Himan J 3 years, 6 months ago

1)1059=2*399+261 2)399=1*261+135 3)261=1*135+126 4)135=1*126+9 5)126=14*9+0 °° HCF(1059,399)=9

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3√5 is smaller or 6√10

Posted by Sarthak Singh 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Himan J 3 years, 6 months ago

3✓5

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Application to trigonometry

Posted by Hera Hades 3 years, 6 months ago

CBSE > Class 10 > Mathematics

0 answers

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4x+9y=1/2,12x+12y=1

Posted by Rithanya Varshini 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Muskan Sharma 3 years, 6 months ago

=4x+9y=1/2 .....(1) = 12x+12y=1 =} 12(x+y)=1 =} x+y=1 =} x=1-y .....(2) By putting eq. (2) in (1) :- 4(1-y)+9y=1/2 =} y = -7/10 = x = 1-y =} x= 17/10

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Chapter 2 exercise 2.2, 1 part

Posted by Salony H 3 years, 6 months ago

CBSE > Class 10 > Mathematics

1 answers

Luckey Saxena 3 years, 6 months ago

867and 225

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The age of his father is twice the sum of the ages of his equal to the sum of the ages of his children find the father age

Posted by Dharun R 3 years, 6 months ago

CBSE > Class 10 > Mathematics

2 answers

Dheeraj Agarwal 3 years, 6 months ago

father's age x and children age y so father's age is twice of children age. therefore fathers age 2x and children age 2 (2y)=4y

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Surya S 3 years, 6 months ago

If the age of a grand child is x yrs, let us assume there are two children, then the father age would be 2x. when the father is 2x,then grand father age is twice the father so, 2(2x) = 4x.

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