Question

How do you multiply `(3u^2 - n)^2`?

Answer 1

`9u^4-6u^2+n^2`

Explanation:

`(3u^2-n)(3u^2-n)`

`9u^4-3u^2n-3u^2n+n^2`

`9u^4-6u^2+n^2`