Factotise a power 4-4a square-21 by splitting the middle term
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a⁴-4a²-21
a⁴+3a²-7a²-21
a²(a²+3)-7(a²+3)
(a²-7)(a²+3)
a⁴+3a²-7a²-21
a²(a²+3)-7(a²+3)
(a²-7)(a²+3)
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