# How do you factor (pi)r^2 - 4(pi)r+4(pi) ?

Oct 2, 2016

=$\pi {r}^{2}$

#### Explanation:

Before you factor, you will see that there are two terms which are additive inverses. We end up with one term!

$\pi {r}^{2} - 4 \pi r + 4 \pi r$

=$\pi {r}^{2}$

If you factor anyway - take out a common factor of $\pi r$

=$\pi r \left(r + 4 - 4\right)$

=$\pi r \left(r\right)$

=$\pi {r}^{2}$