## Algebra: A Combined Approach (4th Edition)

width $= 5x-1+\frac{20}{x^2}$ feet
Area = length $\times$ width $(15x^3-3x^2+60) = 3x^2 \times$ width width $= \frac{15x^3-3x^2+60}{3x^2}$ width $= 5x-1+\frac{20}{x^2}$