b²+4b-3b-12=b²+b-12 .....
(b-3)*(b+4)=b*b+4b-3b-3*4=b²+b-12.
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b²+4b-3b-12=b²+b-12 .....
(b-3)*(b+4)=b*b+4b-3b-3*4=b²+b-12.