Question

factorise x cube + 2 x square - X - 2

Answer 1

Xcube + x square - x - 2
X square (x+2) - 1(x+2)

Answer 2

x^3 +2x^2 -x -2
= x^2 (x+2) -1 (x+2)
= (x^2 -1)(x+2)

Hence factorised......