f(x) =3x-5/4x+1 jawab dong turunan fungsi aljabar

jawabannya f¹(x) = 3x - 5/4

u(x) = 3x-5
u'(x) = 3

v(x) = 4x+1
v'(x) = 4

f'(x) = (v(x).u'(x) + u(x).v'(x))/v(x)^2
       = ((4x-1).3 + (3x-5).4)/(4x+1)^2
       = (12x -3 +12x -20)/(4x+1)^2
       = (24x -23)/(4x+1)^2