Question

How do you find the product of `(7v^2-6)(7v^2+6)`?

Answer 1

`(7v^2-6)(7v^2+6) = 49v^4-36`

Explanation:

It's probably easiest to recognise that this is of the form:

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

So:

`(7v^2-6)(7v^2+6) = (7v^2)^2-6^2 = 49v^4-36`