## Algebra 1: Common Core (15th Edition)

The possible dimensions of the pedestal are $7x,\ 3x-2$ and $3x+2$.
$63x^{3}-28x=$ ...factor out the GCF. $=7x(9x^{2}-4)$ ...write $9x^{2}-4$ as a difference of two squares. $=7x(3x-2)(3x+2)$ The possible dimensions of the pedestal are $7x,\ 3x-2$ and $3x+2$.