Question

For what value of k is -2 a zero of the polynomial 3x2+4x+2k?

Answer 1

if -2 is zero of the polynomial 3x²+4x+2k then
3(-2)²+4(-2)+2k =0
3(4)-8+2k=0
12-8+2k=0
4+2k=0
2k=-4
k= -4/2 = -2