Verified answer

[tex] \frac{25 - m}{ \sqrt{m - 5} } \\ \frac{25 - m}{ \sqrt{m - 5} } \times \frac{ \sqrt{m - 5} }{ \sqrt{m - 5} } \\ \frac{(25 - m) \sqrt{m - 5} }{ \sqrt{m - 5 \sqrt{m - 5} } } \\ \frac{(25 - m \sqrt{m - 5} }{m - 5} [/tex]

[tex]\displaystyle\bf\\\frac{25-m}{\sqrt{m} -5} =\frac{5^{2} -(\sqrt{m} )^{2} }{\sqrt{m} -5} =-\frac{(5-\sqrt{m} )(5+\sqrt{m}) }{5-\sqrt{m} } =-(5+\sqrt{m})[/tex]