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For what real values of $a$ is the expression $\frac{a+3}{a^2-4}$ undefined? List your answers in increasing order separated by commas.

 Aug 28, 2020
 #1
avatar+1042 
+1

The only way for a number to be undefined (well, not only, but in this case) is if the denominator is 0. So that is what we do: set the denominator to 0.

 

a^2 - 4 = 0

a^2 = 4

a = -2, 2

 

Simple!

 

:)

 Aug 28, 2020

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