factorise 9a4 – a2 + 16
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- Khushali.S.S.
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Answered by
7
Answer:
(3a²+5a+4) (3a²-5a+4)
Step-by-step explanation:
9a⁴-a²+16
={(3a²)²+2(3a²)(4)+(4)²} – 25a²
=(3a²+4)²-(5a)²
=(3a²+4+5a) (3a²+4–5a)
=(3a²+5a+4) (3a²–5a+4)
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