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OpenStudy (anonymous):
(r^3-4r)/(r^2-81)
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OpenStudy (mertsj):
What are you supposed to do with these binomials? Multiply them? Factor them?
OpenStudy (saifoo.khan):
(r^3-4r)/(r^2-81) write the numbers which make this undefined.
OpenStudy (saifoo.khan):
Answer = 9, -9
OpenStudy (anonymous):
find all number for which the rational expression is undefined
OpenStudy (mertsj):
Just what saifoo said
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