Posted by **Swtpllypb** on Saturday, September 12, 2009 at 10:55am.

For what values of x is the following expression: 1/(x^2-25). How do you solve and determined the undefined value? Thanks!

- algebra -
**Cool rich.**, Saturday, September 12, 2009 at 11:18am
(x^2-25)=0

Get the square root of x^2-25

=(X-5)(X+5)

5 -5

- algebra -
**bobpursley**, Saturday, September 12, 2009 at 11:31am
the expression has to be an equation, equal to something. In the cool rich response, it is wrong. the expression X^2-25=0 cannot ever be here, as the expression has that in the denominator, and division by zero is never allowed.

- algebra -
**drwls**, Saturday, September 12, 2009 at 11:57am
I think your question left out an important word. Did you mean to write:

<<For what values of x is the following expression undefined?

1/(x^2-25).>>

The answer to THAT question is the two values of x for which the denominator is zero.

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