Question

thực hiện phép tính 
(x-1)(x+1)(x+2) 
 

Answer 1

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

=(x²-1²).(x+2)

=(x²-1).(x+2)

=x².(x+2) - 1.(x+2)

=x³+2x²- x-2

Answer 2

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

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

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

Answer 3

=(x^2_1)(x+2)

=x³-x+2x²-2