#### Answer

($x^{2}$ + 4)($x^{2}$ - 4)

#### Work Step by Step

We know that (a + b)(a - b) = $a^{2}$ - $b^{2}$, so we take the square root of each term in the polynomial to get a and b. We get $x^{2}$ and 4, so the factorization is ($x^{2}$ + 4)($x^{2}$ - 4).