Question

giúp em với mn ơi :<<

Answer 1

\(=2x^2+6x-x-3-x^2-6x-9-x^2+4=-x-8\)

Answer 2

\(\left(x+3\right)\left(2x-1\right)-\left(x+3\right)^2-\left(x+2\right)\left(x-2\right)=x\left(2x-1\right)+3\left(2x-1\right)-\left(x^2+6x+9\right)-\left(x^2-4\right)=2x^2-x+6x-3-x^2-6x-9-x^2+4=-x-8\)