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

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Question 171486: What are the steps to determine the restricted values?
x^2-4x-21/x^2+16
Answer by Mathtut(3670) About Me  (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
:
x%5E2%2B16=0
:
x%5E2=-16
so the only restricted values are complex numbers.....all real numbers solutions will work in this equation.
to be specific x=sqrt%28-16%29=sqrt%28-1%2816%29%29=4i