SOLUTION: Find all the numbers for which the rational expression is undefined. 7/x^2+81 (7 over x squared + 81)

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Find all the numbers for which the rational expression is undefined. 7/x^2+81 (7 over x squared + 81)      Log On


   

Question 43175: Find all the numbers for which the rational expression is undefined.
7/x^2+81 (7 over x squared + 81)
Answer by Nate(3500) About Me  (Show Source):
You can put this solution on YOUR website!
7%2F%28x%5E2+%2B+81%29
Seven divided by zero is undefined:
x%5E2+%2B+81+=+0
x%5E2+=+-81
x+=+sqrt%28-81%29 and x+=+-sqrt%28-81%29
x+=+9i and x+=+-9i