Very simple limit problem

i am not sure if i am posting in the right section anyway i have a problem that is driving me insane, basically i have solve a limit for -4 while the expression is -(9/x+4).

If i input -4 it will give me -9/0 which is wrong. The tip is that i need to do some algebraical modification to the expression, but i tried everything and it always gives me undefined. I appreciate your time...

Thank you

Re: Very simple limit problem

If I interpret your question correctly the limit you have to calculate is:

Have you ever seen that:

(a>0 gives , a<0 gives )

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Re: Very simple limit problem

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That limit doesn't exist.

Some limits with, for example, "9/0" would be considered "infinity", in the extended sense. But your example tends to +/- infinity, depending on the approach.