The given points are
[tex]A(4,-5),B(4,3)[/tex]The midpoint can be found with the following formula
[tex]M=(\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})[/tex]Using the given points, we have
[tex]\begin{gathered} M=(\frac{4+4}{2},\frac{-5+3}{2})\rightarrow M=(\frac{8}{2},\frac{-2}{2}) \\ M=(4.-1) \end{gathered}[/tex]