Factarise 4a 2 -9b 2 -2a-3b
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4a 2-9b 2-2a-3b
apply a2-b2 =(a+b)(a-b)
(2a)2-(3b)2-2a-3b
(2a+3b)(2a-3b)-2a-3b
(2a+3b)(2a-3b) -1(2a+3b)
now take 2a+3b as common in both brackets
(2a+3b)[2a-3b-1]
apply a2-b2 =(a+b)(a-b)
(2a)2-(3b)2-2a-3b
(2a+3b)(2a-3b)-2a-3b
(2a+3b)(2a-3b) -1(2a+3b)
now take 2a+3b as common in both brackets
(2a+3b)[2a-3b-1]
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