Question

Rút gọn biểu thức: (x-1)(x+2)+ (x+1)x.Giúp mk nhé!

Answer 1

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

Answer 2

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

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

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

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

tíc mình nha

Answer 3

Minh ánh, bn viết sai đầu bài rồi