F(x)=5/x ; x°=-1

It looks like you are working with the function \( F(x) = \frac{5}{x} \) and are interested in it at the point where \( x = -1 \).

To find the value of \( F(-1) \), you can substitute \(-1\) for \(x\):

\[ F(-1) = \frac{5}{-1} = -5 \]

So, \( F(-1) = -5 \).

If you need additional information, such as the derivative or specific properties of the function, feel free to ask!