# How do you factor pr + 7p + tr + 7t?

Jul 9, 2016

$p r + 7 p + t r + 7 t = \left(p + t\right) \left(r + 7\right)$

#### Explanation:

Using factoring by grouping :

$p r + 7 p + t r + 7 t = \left(p r + 7 p\right) + \left(t r + 7 t\right)$

$= p \left(r + 7\right) + t \left(r + 7\right)$

$= \left(p + t\right) \left(r + 7\right)$