Question

Find all the zeroes of the polynomial x3+3x2-4x-12 , if one of its zeroes is -3.

Answer 1

Answer:

x³+3x²-4x-12=0

x²(x+3) -4(x+3)= 0

(x²-4) (x+3)=0

(x²-4) =0, x+3=0

x²=4, x=-3

x=±2, x=-3