Question

For what value of K, is -2 a zero of the polynomial 3x^2+4x+2k

Answer 1

P(-2)=3(-2)^2+4(-2)+2k
=12-8+2k
= 4+2k
-6=k

Answer 2

g(x) = -2
put g(x) into p(x)
p(x) = 3x^2+4x+2k
= 3(-2)^2+4(-2)+2k=0
3(4)-8+2k=0
12-8+2k=0
4+2k =0
2k = -4
k = -4/2
k = -2