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Posted by on Sunday, May 30, 2010 at 11:29am.

Find all numbers for which the rational expression is undefined.

r^3-8r/r^2-25

  • algebra - , Sunday, May 30, 2010 at 11:42am

    If you have (r^2-25) in the denominator, then r=+- 5 is not allowed. It is not allowed to divide by zero.

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