Differentiate: (sqrt x) + 5 / (sqrt x) - 5

Question

How do I solve this one:

Differentiate:  (sqrt x) + 5 / (sqrt x) - 5

Comments

I appreciate the help, but this answer does not coincide with the answers I have to choose from.
dy/dx =  (sqrt x) + 5 / (sqrt x) - 5^2
dy/dx = 5/(sqrt x) (sqrt x) - 5^2
dy/dx = 5/2(sqrt x) (sqrt x) - 5^2
dy/dx =  5(sqrt x)  / (sqrt x) - 5^2

Answer 1

sqrt(x)=x^1/2....dy/dx=(1/2)*x^-1/2...or 1/[2*sqrt(x)]

d(-5)/dx=0

5/sqrt(x)=5*x^-1/2

dy/dx=-(1/2)*5*x^-3/2

=-2.5x^-3/2