Mathematics
OpenStudy (anonymous):

How can you determine if a rational expression is undefined?

OpenStudy (anonymous):

When the denominator is equal to zero.

OpenStudy (amistre64):

${any\#\over0}=undefined$

OpenStudy (anonymous):

amistre64 how did you get that fraction to appear that way; I can't seem to figure it out

OpenStudy (anonymous):

$testing \frac{x}{y}$ - thanks mattfeury!

OpenStudy (amistre64):

yeah, like that :)