Question

9a2 - (a2 - 4)2
maths plz help ​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

9a

2

−(a

2

−4)

2

=(3a)

2

−(a

2

−4)

2

=(3a−(a

2

−4))(3a+(a

2

−4))

=(3a−a

2

+4)(3a+a

2

−4)

=(−a

2

+3a−4)(a

2

+3a−4)

=(−a

2

+4a−a−4)(a

2

+4a−a−4)

=[a(−a+4)+1(−a+4)][(a+4)(a−1)]

=(a+1)(4−a)(a+4)(a−1)