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OpenStudy (anonymous):
Don't know where to start. Find all numbers for which the rational expression is undefined. t^3-4t/t^2-81 thanks
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OpenStudy (amistre64):
its undefined when the bottom of the fraction = 0
OpenStudy (amistre64):
i see i difference of squares under there
OpenStudy (amistre64):
basically, when t= +-9 it goes bad real fast
OpenStudy (anonymous):
ok..shaky but i understand a little better
OpenStudy (amistre64):
t^3-4t ------ t^2-81 <-- if this part = 0; it is undefined 1/0 is bad
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