Question

How would you factor x^4-81? I need to see the steps; I have the answer but not how you get it.

Answer 1

\[x^4-81=(x^2)^2-9^2=(x^2-9)(x^2+9)\]
\[=(x-3)(x+3)(x^2+9)\]

Answer 2

Thanks!

Answer 3

That was pretty nice. I would fan you, Anwar, if not for you getting so cheeky earlier!

Answer 4

Newton is a fan of me.. YAAY!! :)

Answer 5

When was I cheeky? I am never cheeky, if I know what that means :P