a²-4a+4+a²+4a=2a²+4=2(a²+2)
b²+2b+b+2+b²-6b+9=2b²-3b+7
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a²-4a+4+a²+4a=2a²+4=2(a²+2)
b²+2b+b+2+b²-6b+9=2b²-3b+7