log72 (x2 - x) = 1
In exponential form, we have
72^1 = x^2 - x rearrange
x^2 - x - 72 = 0 factor
(x - 9) (x + 8) = 0 and setting each factor to 0, we have that x = 9 and x = -8
And both solutions "work".....
