Question

factorise 9a4 – a2 + 16

Answer 1

Hope this helps you. .

- Khushali.S.S.

Answer 2

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)