# How do you factor #4q^2 - 49#?

##### 1 Answer

Apr 21, 2016

#### Explanation:

The difference of squares identity can be written:

#a^2-b^2 = (a-b)(a+b)#

In our example, both

#4q^2-49 = (2q)^2-7^2 = (2q-7)(2q+7)#