Answers

2014-08-18T22:30:50+08:00
 x^{2} -4x-12= (x-6)(x+2)

12-4x- x^{2} = (6+x)(2-x)= -(x+6)(x-2)



 x^{2} -4x-12 and  12-4x- x^{2} do not have the same factors...
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