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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