a power5 - a power4 - 16a +16 ÷ a² + 4
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Step-by-step explanation:
a⁴(a-1)-16(a-1) / (a²+4)
(a-1)(a⁴-16) / (a²+4)
(a-1)(a²+4)(a²-4) / (a²+4)
(a-1)(a²-4)
(a-1)(a-2)(a+2)
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