0
x2 - x = 12
Rewrite as x2 - x - 12 = 0
Now you can solve by factoring as you do most polynomials.
(x - ?)(x + ?)
Find the factors of -12 that also add up to -1
In this case, -4 and 3
(x - 4)(x + 3) = 0
Solve individually because anything multiplied by zero is zero
x - 4 = 0
x = 4
x + 3 = 0
x = -3
So your answers are -3,4. You can check by popping them into the original equation.
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