Jika f(x)=3x maka tentukan lim h->0 f(x+2h)-f(x) --------------- h

f(x) = 3x
f(x + 2h) = 3(x + 2h) = 3x + 6h

lim [h-->0] (f(x + 2h) - f(x))/h
= lim [h-->0] (3x + 6h - 3x]/h
= lim [h-->0] (6h/h)
= 6