Question

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

Answer 1

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

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

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

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

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

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

Answer 2

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

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

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

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

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

Answer 3

đề yêu cầu gì vậy cho đè gì thiếu yêu cầu làm sao đc

Answer 4

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