SOLUTION: Find all numbers for which the rational expression is undefined. r^3-4r/r^2-16

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: Find all numbers for which the rational expression is undefined. r^3-4r/r^2-16      Log On


   

Question 287898: Find all numbers for which the rational expression is undefined.
r^3-4r/r^2-16
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
(r^3-4r)/(r^2-16)
It would be undefined if r^2-16=0
If r=-4 or r=+4 then it would equal 0