Question

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

Answer 1

3xsq+4x+2k put the value of x=-2 because it is a zero of equation
now
3xsq+4x+2k
3(-2)sq+4(-2)+2k=0
3(4)-8+2k=0
12-8+2k=0
4+2k=0
2k=-4
k=-4/2
k=-2
so the value of k is -2

Answer 2

p(x)=3x^2+4x+2k=0
p(-2)=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