Question

If 3 is one of the zeros ofx3+ 3x2+kx-24

Answer 1

substitute 3 in the value x

0 = (3)³ + 3(3)² + 3k - 24

0 = 27 + 27 + 3k - 24

0 = 3k = -30

k = $\large\boxed{-10}$