The middle number is 0 and the last is -81Factoring means we want something like(b+_)(b+_)We need two numbers that add together to get and Multiply to get -81which are 9 and -9:9+-9 = 0 and 9*-9 = -81 Fill in the blanks in (b+_)(b+_) with 9 and -9 to get...(b+9)(b−9) The answer is : (b+9)(b−9)
