Rational Expressions

Please help me solve : ((4x^2-x-12)/(x^2+9x+18)) / ((x^2+x-20)/(x^2+8x+15)) Your awesome

Your Answer:

if we invert the divisor and rewrite as multiplication then


Factoring is a little tedious, but you can verify that when factored we get:




next we cancel:




and finally...