Question

-a^4+80a^2-1024 factorise ​

Answer 1

Answer:

$-a^4+80a^2-1024\\= -\left(a^4-80a^2+1024\right)\\= -\left(a+4\right)\left(a-4\right)\left(a+8\right)\left(a-8\right)$

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