Question 241503
In order for a fraction to be undefine, its denominator would equal to zero.  So, let the denominator (by itself) equal to zero and find the solution(s).
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{{{n^2-4=0}}}
{{{n^2=4}}}
Take the square root on both sides of the equation to determine the value of n.
{{{sqrt(n^2)=sqrt(4)}}}
Since the square root of a number raised to the 2nd power cancel each other, we can re-write the equation like this:
{{{n=sqrt(4)}}}
This will yield two possible answers:
n=2 and n=-2
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Check:
{{{2^2=2*2=4}}}
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{{{-2^2=-2*(-2)=4}}}