What are all values of #x# for which #(x+9)/(x^2-81)# is undefined?

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Answer 1 · 2016-11-10T20:06:43

This will be undefined when#x# is 9 or -9.

This equation is undefined when #x^2 - 81# is equal to #0#.

Solving for #x^2 - 81 = 0# will give you the values of #x# for which this term is undefined:

#x^2 - 81 = 0#

#x^2 -81 + 81 = 81#

#x^2 = 81#

#sqrt(x^2) = sqrt(81)#

#x = +-9#