Question

(x2 + 4)(x2 - 4)

Answer 1

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Answer 2

sorry; (X2 + 4)(x^2 - 4)
we do the foil technique where you multiply each part of the term by the other.
(x^2 * x^2) (x^2 * -4) (4 * x^2) (4 * -4)
then we simplify each by solving
(x^4) (-4x^2) (4x^2) (-16)
As you can see (-4x^2) and (4x^2) are coefficients so they eliminate each other. because it ends up as zero when you add them.
so the answer would be x^4 -16

Answer 3

missed a few + notations, but overall a good explanation, thnx ;)