SOLUTION: What are the steps to determine the restricted values? x^2-4x-21/x^2+16

Question 171486: What are the steps to determine the restricted values?
x^2-4x-21/x^2+16
Answer by Mathtut(3670) (Show Source): You can put this solution on YOUR website!
the denominator cannot be equal to zero or the results will be undefined.....so set the denominator equal to zero and solve
:

so the only restricted values are complex numbers.....all real numbers solutions will work in this equation.
to be specific x===
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