How would you simplify -10 -sqrt48 over -2

If you mean [-10 - √48 ] / -2

       =  [-10 - √16·√3] / -2  =  [-10 - 4√3] / -2  =  5 + 2√3.

If you mean -10 - √48/-2

       =  -10 - √16·√3/-2  =  -10 - 4√3/-2  =  -10 + 2√3

do you mean:

(-10 - √48)

divided by:

-2

??