### Home > CALC > Chapter Ch3 > Lesson 3.4.4 > Problem 3-187

3-187.

Expand the numerator.

Combine like terms.

Factor out an *h*.

Cancel out the *h*.

Evaluate the limit *h*→0.... this is *f* '(*x*).

Graph that on your calculator. Also sketch the derivative function you found in part (a). The sketches should look a lot alike.