# How do you factor #1 - 4y^2#?

##### 2 Answers

Mar 3, 2018

#### Explanation:

#"this is a "color(blue)"difference of squares"#

#•color(white)(x)a^2-b^2=(a-b)(a+b)#

#"here "a=1" and "b=2y#

#rArr1-4y^2=(1-2y)(1+2y)#

Mar 3, 2018

#### Explanation:

We have an identity for

So ,