If you were asked to solve such a quadratic function, your last step would have been x = -1; x = 6 Then the step before that would have been: x + 1 = 0; x - 6 = 0 Then the step before that would have been: (x + 1)(x - 6) = 0 Then the step before that would have been: x² - 5x - 6 = 0 Then the step before that would have been: f(x) = x² - 5x - 6 Edwin