а4 -7a2 + 12 factorise
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Answer:
(a+2)(a-2)(a²-3)
Step-by-step explanation:
a⁴-7a²+12
=a⁴-4a²-3a²+12
=a²(a²-4)-3(a²-4)
=(a²-4)(a²-3)
={(a)²-(2)²} (a²-3)
=(a+2)(a-2)(a²-3)
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