Posted by **Gabby** on Wednesday, March 14, 2012 at 9:19pm.

Find all numbers that must be excluded from the domain of the given rational expression.

1) x^2+4x/x^2-16

2) 6x^3y-6xy/x^3+5x^2+4x

3) 4-x^2/x^2+x-6

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