Question

Factor completely.

http://media01.switchedononline.com/g_alg01_2010/7/24.gif

Answer 1

The anwser would be (x^4 + 9)(x²+3)(x²-3)

Answer 2

why (x^4+9) can not be factor more and (x^4-9) can? (just the ones that have negative signs can?)

Answer 3

Yes.^^

Answer 4

Difference of squares, that's what they are called.

Answer 5

thanks