Question

The value of k is for which -4 is a zero of polynomial x2-x-2k+2

Answer 1

apply x=-4
then
-8 +4 -2k+2=0
-2k-2=0
-2k=2
k=-1

Answer 2

X2-x-2k+2
(-4)2-(-4)-2k+2
16+4-2k+2
22-2k=0
-2k=-22
k=-22/-2
k=11