Factorise a^4-20a^2+64 completely.
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Step-by-step explanation:
a⁴-20a²+64
a⁴-16a²-4a²+64
a²(a²-16)-4(a²-16)
(a²-16)(a²-4)
(a²-4²)(a²-2²)
(a+4)(a-4)(a+2)(a-2)
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