Factor 64 – x15.

Rewrite 64 − x¹⁵ as 4³ − (x⁵)³. Using the difference-of-cubes rule, a³ − b³ = (a − b)(a² + ab + b²), with a = 4 and b = x⁵, gives (4 − x⁵)(16 + 4x⁵ + x¹⁰), which is choice D.

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