Question 711925
5b^2 + 9b = 0


b(5b + 9) = 0 ... factor


b = 0 or 5b+9 = 0  ... using the Zero Product Property here


b = 0 or 5b = -9


b = 0 or b = -9/5


The two solutions are b = 0 or b = -9/5