# How do you factor by grouping y^2+7y+3y+21?

##### 1 Answer
Apr 21, 2015

Collect $y$ frm the first and third term and $7$ from the second and fourth:
$y \left(y + 3\right) + 7 \left(y + 3\right) =$
$= \left(y + 3\right) \left(y + 7\right)$