Question

For what value of k, -4 is a zero of polynomial x2-x-(2k+2)?

Answer 1

Hmm
well, um
if -4 is  a zero then if we subsitute -4 for x, we should get 0

so
0=(-4)²-(-4)-(2k+2)
0=16+4-2k-2
0=18-2k
2k=18
divide by 2
k=9

k=9
the value k is 9