Question

(x-1)(x+1)(x+2)

Answer 1

\(\left(x-1\right)\left(x+1\right)\left(x+2\right)\)

\(=\left(x^2-1\right)\left(x+2\right)\)

\(=x\left(x^2-1\right)+2\left(x^2-1\right)\)

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

Answer 2

\(\left(x-1\right)\left(x+1\right)\left(x+2\right) \)

=\(\left(x^2-1\right)\left(x+2\right)\)

=\(x\left(x^2-1\right)-2\left(x^2-1\right)\)

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