Question

factorise 9(b+2a)²-4a²​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

9(b+2a)^2-4a^2

={3(b+2a)}^2-(2a)^2

=(3b+6a)^2-(2a)^2

=(3b+6a+2a)(3b+6a-2a)

=(8a+3b)(4a+3b)