x2 -x -12 = 0
(x+3)(x-4) = 0
Therefore, x = -3 & 4
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5 or 12
It also equals 13 12.
X=-3
It is a quadratic equation in X, with two real roots.
The answer is 4 squared minus 2 squared as 4 squared is 16 minus 2 squared, which is 4, gives you 12 as an answer.