Question

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

Answer 1

\(=\left(x^2-1\right)\left(x+2\right)=x^3+2x^2-x-2\)

Answer 2

\(=\left(x^2-1\right)\left(x+2\right)=x^3+2x^2-x-2\)

Answer 3

(x – 1)(x + 1)(x + 2)

= [x.(x + 1) – 1.(x + 1)].(x + 2)

= (x2 + x – x – 1)(x + 2)

= (x2 – 1)(x + 2)

= x2( x + 2) – 1.(x + 2)

= x2.x + x2. 2 – 1.x – 1. 2

= x3 + 2x2 – x – 2