CPM Homework Help : PC3 Problem 3-137

Simplify: $\large \frac { a ^ { 3 } - 2 a ^ { 2 } - 15 a } { a ^ { 3 } + a ^ { 2 } - 30 a }$

Step:

$\frac{a\left(a^2-2a-15\right)}{a\left(a^2+a-30\right)}$

Keep factoring.