Given P(x)=x3+kx2+5x+6P(x) = x^3 + kx^2 + 5x + 6P(x)=x3+kx2+5x+6, find kkk such that (x+2)(x + 2)(x+2) is a factor of P(x)P(x)P(x).
k=2k = 2k=2
k=4k = 4k=4
k=6k = 6k=6
k=8k = 8k=8