[tex]\displaystyle x^2-x-12=x^2+3x-4x-12=x(x+3)-4(x+3)=(x+3)(x-4)[/tex]
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[tex]\displaystyle x^2-x-12=x^2+3x-4x-12=x(x+3)-4(x+3)=(x+3)(x-4)[/tex]