Question

Factorise 12 a square - 8ab - 15 b square

Answer 1

First split -8ab into -18ab and 10ab

12a²  - 18ab  + 10ab + 15b² we get:

= 6a (2a - 3b) + 5a(2a - 3b)

= (2a - 3b) (6a + 5a)

This is the required answer.

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