Question

please tell don't spam​

Answer 1

Step-by-step explanation:

(a+2)(a-2)(a²+4)

[a(a-2)+2(a-2)](a²+4)

[a²-2a+2a-4](a²+4)

(a²-4)(a²+4)

a²(a²+4)-4(a²+4)

a⁴+4a²-4a²-16

a⁴-16

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