## happykiddo 3 years ago simplify

Show me how to simply this rational expression....... $\frac{ x ^{2}-x }{x ^{2}+9x+20 }\div \frac{ x ^{2}-1 }{x ^{2}-2x+1}$ To get...... $\frac{ x(x-1) }{ (x-2)(x+1)}$