Question

How do you factor `1 - y^2`?

Answer 1

The factorised form is:
`color(blue)((1 +y) (1-y))`

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 = color(blue)((1 +y) (1-y))`