[tex]\displaystyle 2x^2+4x-6=2(x^2+2x-3)=2(x^2+3x-x-3)=2(x(x+3)-(x+3))=2(x+3)(x-1)[/tex]
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[tex]\displaystyle 2x^2+4x-6=2(x^2+2x-3)=2(x^2+3x-x-3)=2(x(x+3)-(x+3))=2(x+3)(x-1)[/tex]