Factorise:9(2a-b)square - 4(2a-b)-13

1.	Factorise:9(2a-b)square - 4(2a-b)-13
Answer» [9(2a-b) + 13][2a-b-1](18a-9b+13)(2a-b-1) 9(2a-b) ² - 4(2a-b) - 13Let\'s take 2a-b be x9x² - 4x - 139x² -9x + 13x - 13 [Middle term splitting] 9x(x-1) + 13(x-1)(9x+13)(a-1)

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