Question

7. If one zero of the quadratic polynomial f(x) = 4x^2 - 8kx-9 is negative of the other,
find the value of k.​

Answer 1

Answer:

let one root is a

then other root is -a

then

a+(-a)=8k/4

0=k

k=0

Answer 2

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THE CORRECT ANSWER WILL BE

k = 0

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Let the zeroes are

P and - P

given f(x) = 4x^2 - 8kx - 9

( On comparing f(x) with ax^2 + bx + c we get : a= 4;

b= -8k ; c = -9 )

we know that,

Sum of zeroes = -b/a

P + ( - p) = - (- 8k) / 4

0 = 8k/4

8k = 0

k = 0

HENCE K = ZERO