(x-2y)^2 +7(x-2y)+12
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let x-2y=t
t^2+7t+12=t^2+4t+3t+12
=t(t+4)+3(t+4)
=(t+4)(t+3)
x-2y+4and x-2y+3
t^2+7t+12=t^2+4t+3t+12
=t(t+4)+3(t+4)
=(t+4)(t+3)
x-2y+4and x-2y+3
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