factorise:(x-2y)^2+7(x-2y)+12
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Answer:
=> (x-2y)^2+7(x-2y)+12
=> (x-2y)^2+4(x_2y)+3(x-2y)+12
=> (x-2y)(x-2y+4)+3(x-2y+4)
=> (x-2y+4)(x-2y+3)
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