f(x) = 2 / x+3 tentukan f'(x)

f(x) = 2/x+3 , f'(x) = ?
u = 2 => u' = 0
v = x+3 => v' = 1
f'(x) = u'. v - u. v' / v²
= 0.x+3 - 2.1 / (x+3)²
= -2 / (x+3)²