[tex](x+4)(x-2)-(x+6)(x-4)=x^{2} -2x+4x-8-(x^{2} -4x+6x-24)=x^{2} +2x-8-x^{2} +4x-6x+24=-8+24=16[/tex]
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[tex](x+4)(x-2)-(x+6)(x-4)=x^{2} -2x+4x-8-(x^{2} -4x+6x-24)=x^{2} +2x-8-x^{2} +4x-6x+24=-8+24=16[/tex]