Question

if x=-1/2 is zero of p(x) =8x ^3-k find the value of k

Answer 1

p( - 1 /2 ) = 8 ( -1 /2 ) ^3 - k


0 = 8 * (-1 / 8 ) - k


0 = -1 - k

- k = 1

k = -1 Ans .

Answer 2

Hey!!

Here,

X = - 1 / 2 is a zero of P ( X ) = 8X^3 - k

P ( X) = 8X^3 - k

P (- 1 / 2) = 8 ( - 1 / 2 )^3 - k

=> 0 = 8 ( -1 / 8) - k

=> 0 = - 8/8 - k

=> 0 = - 1 - k

=> k = - 1.
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Hope it will helps you:-)