Question

How do you factor `49x^2 -81`?

Answer 1

`(7x+9)(7x-9)`

Explanation:

Given -

`49x^2-81`

It is in the form `a^2-b^2`

Factors for the expression `a^2-b^2` is `(a+b)(a-b)`

Following this, we can find the factors for the given expression `49x^2-81`

`(7x+9)(7x-9)`