Question

giải phương trình sau:
(x+2)(x-3) = (2x+1)(x+2)

Answer 1

=>(2x+1)(x+2)-(x+2)(x-3)=0

=>(x+2)(2x+1-x+3)=0

=>(x+2)(x+4)=0

=>x=-2 hoặc x=-4

Answer 2

\(\left(x+2\right)\left(x-3\right)-\left(2x+1\right)\left(x+2\right)=0\)

\(\Leftrightarrow\left(x+2\right)\left(x-3-2x-1\right)=0\Leftrightarrow\left(x+2\right)\left(-x-4\right)=0\Leftrightarrow x=-2;x=-4\)