Question 853990
Guess not!
f(x)=3x-1.
f(x+h)=3(x+h)-1=3x+3h-1.


Replace them into the expression.


{{{(3x+3h-1-(3x-1))/h}}}
{{{(3h-1+1)/h}}}
{{{3h/h}}}
{{{highlight(3)}}}.