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4(2b+5)
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b^2 + 8b + 7 factors to (b + 7)(b + 1)
8b = -65 so b = -8.125
13b !
8b
8b^2 -9b +1 8b^2 -8b -b +1 8b(b-1) - 1(b-1) (8b-1)(b-1)