Question

Find the value of k , if -1 is a zero of a polynomial q(x)= kx^2-4x+k

Answer 1

q(-1)= k(-1)^2 -4(-1)+k
which implies
k+4+k =0
2k+4=0
2k=-4
k= -4/2
k= -2

Answer 2

Answer:

Step-by-step explanation

$k(-1)^2$ $-4(-1)+k$

=k + 4 + k

2k = -4

k = -2

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