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The solution to the problem 2x2 is 4 (the result of multiplication).
x2-4x-12 = (x-6)(x+2) when factored
Since x2 - 1 is a multiple of x - 1, it is the LCM of this problem.
It looks as if you typed this problem wrong.
This is not factorable. You would have to do the quadratic formula for this problem.