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Find the roots of the rational polynomia...

Find the roots of the rational polynomial equation `(x^2-6x+8)/(x+2)=0`.

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`(x^2-6x+8)/(x+2)=((x-2)(x-4))/((x+2))` Since the roots of `x^2-6x+8` are {2,4} and that of `x+2` is {-2}. Therefore the critical points are -2,2 and 4.
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