To factorize something, you will need to break it up into two parts. The phrase (b+3)(b+5) when multiplied together will give b^2+8b+15. When factoring something that is in the second order, meaning a variable that is squared, the two factors always have 1 variable and 1 number that when multiplied equal the third part of the initial equation, and when added together, equal the coefficient of the second part of the equation.
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8b^2 -9b +1 8b^2 -8b -b +1 8b(b-1) - 1(b-1) (8b-1)(b-1)
b^2 + 8b + 7 factors to (b + 7)(b + 1)
When simplified it is: 2a+8b+4
8b = -65 so b = -8.125
8b