2(b+1)^2-4b=2(b^2+2b+1)-4b=2b^2+4b+2-4b=2b^2+2=2(b^2+1)
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2(b+1)^2-4b=2(b^2+2b+1)-4b=2b^2+4b+2-4b=2b^2+2=2(b^2+1)