(b-3)(b-4)-(b+4)^2=b^2-7b+12-(b^2+8b+16)=b^2-7b+12-b^2-8b-16=-15b-4
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(b-3)(b-4)-(b+4)^2=b^2-7b+12-(b^2+8b+16)=b^2-7b+12-b^2-8b-16=-15b-4