# solving inequalities using interval notations

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• March 15th 2009, 12:08 PM
ladykim2888
solving inequalities using interval notations
5(2r^3-13)<r Please help me solve this ASAP if possible. the little^ sign means the r is cubed it is raised to the third power.
• March 15th 2009, 12:36 PM
HallsofIvy
Quote:

Originally Posted by ladykim2888
5(2r^3-13)<r Please help me solve this ASAP if possible. the little^ sign means the r is cubed it is raised to the third power.

First solve $5(2r^3- 13)= r$. The values of r that satisfy the equation separate intervals where it is "<" from intervals where it is ">".