## Functions Modeling Change: A Preparation for Calculus, 5th Edition

$$x\left(x+2\right)$$
Recalling that dividing by a fraction is the same as multiplying: $$\frac{x^3}{x-4}\cdot \frac{x^2-2x-8}{x^2} \\ \frac{x\left(x+2\right)\left(x-4\right)}{x-4} \\ x\left(x+2\right)$$