no 4 tolong di jawab yaa.. ^^

f'(x) = turunan dari -2 x^(-1/2)
= -2 . -1/2 . x^(-3/2)
= x^(-3/2)
[rumusnya a . U^n = a . n . U^(n-1) . U']
f(x) + f'(x) = -2 / x^(1/2) + 2 / x^(3/2)
samakan penyebut
-2x + 2 / (x^3/2)