1. The problem statement, all variables and given/known data I have to differentiate using the long formula [f(x+h)-f(x)] / (h). 2. Relevant equations f(x) = (1)/(2+x), x=2 3. The attempt at a solution First I wrote [ (1/2+x+h) - (1/2+x) ] / (h). Then I created a common denominator in the numerator. I then made the bottom denominator a fraction. Code (Text): (2+x)-(2+x+h) (1) ___________ x __ (2+x+h)(2+x) (h) I subtracted common variables from the numerator and got. Code (Text): -(h) (1) ________ x ___ [(2+x+h)(2+x)] (h) Then I got: -(1) _______________ (2+x+h)(2+x) But as I expanded the numerator, I found that I couldn't get rid of the last h. What is the problem? Thank you.