Question

factor completely:

1. x^4 + 11x^2 - 80
2. x^2 + 12x + 36 - 9y^2
3. x^3 - xy^2 + x^2y - y^3
4. (x-3)^2(2x+1)^3 + (x-3)^3(2x+1)^2

Answer 1

We will be glad to critique your work.

The first one is (x^2 + 16)(x^2 -5)