Let f(x) = 1 - 5 \sqrt{x} . Then the expression
\frac{f(x + h) - f(x)}{h}
can be written in the form
\frac{A}{\left(\sqrt{Bx + Ch} \right) + \left(\sqrt{x} \right)},
where A , B , and C are
constants. (Note: It's possible for one or more of these
constants to be 0.) Find the constants.

Use your answer from above to find

Finally, find each of the following:

You can earn partial credit on this problem.