Question

factor completely
256-x^4

Answer 1

256-x^4
(16-x^2)(16+x^2)

Answer 2

That is exactly what I thought, but when I put it in the answer box and submit it, it says that it is wrong.

Answer 3

(16-x^2) = (4-x)(4+x)

You just didn't factor it <I>completely.</I>