# How do you factor 1 - y^2?

Mar 23, 2016

The factorised form is:
$\textcolor{b l u e}{\left(1 + y\right) \left(1 - y\right)}$

#### Explanation:

$1 - {y}^{2}$

The above expression can be expressed as:
$1 - {y}^{2} = {1}^{2} - {y}^{2}$

• as per property :
color(blue)(a^2 - b^2 = (a+b)(a-b)

${1}^{2} - {y}^{2} = \textcolor{b l u e}{\left(1 + y\right) \left(1 - y\right)}$