Simplify: (x2+2)(x2−2)+4(x^2 + 2)(x^2 - 2) + 4(x2+2)(x2−2)+4.
x4x^4x4
x4−4x^4 - 4x4−4
x4+4x^4 + 4x4+4
x4−8x^4 - 8x4−8