factorise(2a+b)^2−6a−3b−4
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Step-by-step explanation:
(2a+b)^2−6a−3b−4
=(2a+b)^2−3(2a+b)−4
=(2a+b)^2−4(2a+b)+(2a+b)−4
=(2a+b)((2a+b)−4)+1((2a+b)−4)
=(2a+b−4)(2a+b+1)
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