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15. If zeroes of p(x) = 2x ^ 2 - 7x + k reciprocal of each other (a) 1 (b) 2 (c) 3 (d) -7

Posted by Jayant Kumar Yadav 2 years, 5 months ago

CBSE > Class 10 > Mathematics

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On dividing a polynomial by x²-2 the quotient is found as 2x²+5x-2 and the remainder as -x+14. Find the polynomial .

Posted by Dhiraj Kumar Sah 2 years, 5 months ago

CBSE > Class 10 > Mathematics

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Prove root13 +root 17 is a irrational number

Posted by Kim Mantasha 2 years, 5 months ago

CBSE > Class 10 > Mathematics

2 answers

Muskaan Syed 2 years, 5 months ago

Let √13+√17be rational. √13+√17=a/b.√13=a/b-17.√13=a-√17/b. It's a fact that√13 is irrational. Hence, our assumption is incorrect. Hence proved that √13+√17 is irrational.

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Ayan Ansari 2 years, 5 months ago

Let

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Prove that 2√3 ➗ by 5 is irrational

Posted by Abhijot Brar 2 years, 5 months ago

CBSE > Class 10 > Mathematics

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Anjali Anand 2 years, 5 months ago

(2 SQRT 3)/5 = 2/5 SQRT 3

= RATIONAL X IRRATIONAL = IRRATIONAL (2/5 - RATIONAL SQRT 3 IS IRRATIONAL)

= IRRATIONAL

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Find the value of a, if -3 is zeroes of poly (a^3)x^2-5x+7.

Posted by Annanya Sharma 2 years, 5 months ago

CBSE > Class 10 > Mathematics

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1/x+2/2x-3=1/x-2

Posted by Gaurav Kumar 2 years, 5 months ago

CBSE > Class 10 > Mathematics

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If cot theta = 3/5 sin theta -1/tan theta/2 tan theta

Posted by Ayush Nayak 2 years, 5 months ago

CBSE > Class 10 > Mathematics

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xy/x+y=6/5 xy/you=6

Posted by Muskaan Syed 2 years, 5 months ago

CBSE > Class 10 > Mathematics

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Find roots of the given equation in form of quadratic equation: x²-2ax+a²-b²

Posted by Srishti Pathak 2 years, 5 months ago

CBSE > Class 10 > Mathematics

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2. If one zero of the polynomials (3x2+ 8x + k) is the reciprocal of the other, then value of k is

Posted by Percy . 2 years, 5 months ago

CBSE > Class 10 > Mathematics

1 answers

Anjali Anand 2 years, 5 months ago

3x²+ 8x +k

let a and b are zeroes then b = 1/a (given)

product of zeroes = constant/ coefficient of x² = k/3

a x b = a x 1/a = 1

so k/3 = 1

so k =3

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Prove that (1-cos²A)cosec²A=1

Posted by #Student _ 2 years, 5 months ago

CBSE > Class 10 > Mathematics

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Anjali Anand 2 years, 5 months ago

L.H.S

(1- COS²A ) COSEC²A = SIN² A (1/SIN²A) (SIN²A + COS² A =1) COSEC A = 1/ SIN A

HENCE PROVED

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Two branch of chocolates are available in the backs of 24 and 15 respectively .if a person needs to buy an equal number of chocolates of both kinds what is the least number of boxes each kind he has to buy?

Posted by Kanav Gupta 2 years, 5 months ago

CBSE > Class 10 > Mathematics

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Haripriya K 2 years, 5 months ago

5 and 8

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#Student _ 2 years, 5 months ago

And divide 120 by 24 and 15 respectively we get 5 and 8

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#Student _ 2 years, 5 months ago

LCM of 24 and 15 which is 120

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The sum of two digit number is 9. The number obtained by interchanging the two digits exceeds the given number by 45. Find the number

Posted by Sharvari Sorte 2 years, 5 months ago

CBSE > Class 10 > Mathematics

2 answers

#Student _ 2 years, 5 months ago

Let the number at the ten's place be x and that at the one's place be y. Number obtained = 10x + y The sum of the digits in a two-digits number is 9. .....(I) The number obtained by interchanging the digits exceeds the original number by 27. 10y+x-(10x+y)=27 9(y-x)=27. Y-x=3 .......(ll) Adding (I) and (II) 2y=12 and y=6 x = 3. Hence thr required no is 36

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Dawn To Dusk Twilight Classes 2 years, 5 months ago

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Which of the following is not irrational? (a) (2 – √3)2 (b) (√2 + √3)2 (c) (√2 -√3)(√2 + √3) (d)27√7

Posted by Adarsh Kohli 2 years, 5 months ago

CBSE > Class 10 > Mathematics

2 answers

Muskaan Syed 2 years, 5 months ago

Because (√2-√3) (√2+√3) gives formula a^2-b^2=(a+b) (a-b). So, (√2) ^2-(√3) ^2 = 2-3 = -1. If in a/b form -1/1.Hence proved that option (c) is rational

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Muskaan Syed 2 years, 5 months ago

(c)

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Which book is best for practice extra questions

Posted by Mayank Singh 2 years, 5 months ago

CBSE > Class 10 > Mathematics