# How do you factor 4g ^ { 2} - 40g + 36?

Mar 22, 2017

$\left(4 g - 36\right) \left(g - 1\right)$

#### Explanation:

Find factors of $4$ that when cross multiplied to the factors of $36$ will equal to $- 40$.

For example,

$4 \text{ } - 36$

$1 \text{ } - 1$

When you cross multiply $- 1$ and $4$ to get $- 4$. Then cross multiply $1$ and $- 36$ to get $- 36$. Once you add them, you get $- 40$.