(5*b + 1)*(1 - 5*b)
1*(b + 1/5)*(b - 1/5)
(1*(b + 1/5))*(b - 1/5)
2 1 - 25*b
1 - 25*b^2
(1.0 + 5.0*b)*(1.0 - 5.0*b)
-(1 + 5*b)*(-1 + 5*b)