SOLUTION: Find all numbers for which the rational expression is undefined. n^3 - 7n / n^2 - 9 Thank you so much!

Algebra ->  Expressions-with-variables -> SOLUTION: Find all numbers for which the rational expression is undefined. n^3 - 7n / n^2 - 9 Thank you so much!      Log On


   

Question 323204: Find all numbers for which the rational expression is undefined.
n^3 - 7n / n^2 - 9
Thank you so much!
Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
The expression is "undefined" if the denominator is zero (because you would be dividing by zero). So, set the denominator to zero and solve for n:
n^2 - 9 = 0
factoring
(n+3)(n-3) = 0
n = {-3, 3 }