(2a+3b)^2 -4(2a+3b)= (2a+3b)(2a+3b-4) but sir I want to just tell you that how this second term came
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The given expression can also be written as
(2a+3b)(2a+3b)-4(2a+3b)
taking out (2a+3b) as common
= (2a+3b)(2a+3b-4).
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