f(x)=x(x)-x-12

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I'm willing to guess that you are trying to factor the right side of the equation. x^2 - x - 12 is equivalent to (x - 4)(x + 3)Look here for some additional help.http://www.purplemath.com/modules/factquad.htm

f(x)=x^2-x-12f(x)= (x+3)(x-4)x=-3,4