Question

If -1 is the zero of the polynomial p(x)=x^2-7x-k, then find the value of k.​

Answer 1

p (-1)=

$( - 1) ^{2} - 7( - 1) - k = 0$

1 +7-k =0

8-k=0

-k =-8

k=8

Answer 2

p (x)=x^2-7x-k

p (-1)=(-1)^2-7×-1-k=0

1+7-k=0

k=8

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