F(x)=5x dibagi 1+x maka f'(2) adalah

F(x) = (5x) / ( 1 + x)
U = 5x
U' = 5 (turunan u)
V = 1 + x
V' = 1 (turunan v)
F'(x) = u'.v – u.v' / (v)²
F'(x) = (5).(1+x) – (5x).(1) / ( 1 +x)²
F' (x) = 5 + 5x – 5x / (x+1)²
F'(x) = 5 / ( 1 + x)²
F'(2) = 5 / (1 + (2))² = 5 / (3)² = 5/9
Jadi f'(2) = 5/9