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Homework Statement
For what values of a, from the reals, does the limit exist?
[itex]lim_{x\rightarrow2} (\frac{1}{2-x}-\frac{a}{4-x^{2}})[/itex]
Homework Equations
I chose a so that the denominator would be one. By putting the fractions together.
The Attempt at a Solution
When a = 4 the denominator of the combined fraction can be reduced to one
=> then the limit is -1/4.
(For [itex]a=x+2[/itex] and [itex]a=x^{2}+x-2[/itex] the denominator is 1 too, but at x=2 all three solutions are equal to 4.)
[itex]\textbf{tl;dr}[/itex]
[itex]\textbf{My question: Is 4 the only solution?}[/itex]
In the problem statement a is in plural.
Am I missing any solutions?
Any hints are much appreciated.