Question

Solve (x^2+4)(x^2-4)

Answer 1

If you need to expand, you multiply all the terms:

x^2 * x^2 = x^4
x^2 * -4 = -4x^2
4 * x^2 = 4x^2
4 * -4 = -16

And then combine:

x^4 - 4x^2 + 4x^2 - 16

Which becomes:

x^2 - 16

Answer 2

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