Question

if x = -1/2 is a zero of the polynomial p(x) =8x^3 - kx^2 - x+2, find the value of k​

Answer 1

Step-by-step explanation:

substitute x value in the given polynomial

(8*)(-1/2)^3 - k*(-1/2)^2 - (-1/2 + 2)=0

= -1/8*8 - (-1/4*k) - (3/2)=0

= -1 + k/4 -3/2=0

= k-4/4 =+3/2

k-4 = 12/2

k-4= 6

therefore k= 10

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