Answer
$(x^{2}+4)(x^{4}-4x^{2}+16)$
Work Step by Step
Use the sum of cubes to solve.
(1) $x^{6}+64$
(2) $(x^{2})^{3}+4^{3}$
(3) $(x^{2}+4)((x^{2})^{2}-(x^{2})(4)+(4)^{2})$
(4) $(x^{2}+4)(x^{4}-4x^{2}+16)$
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