So I've been doing good with these until this problem.

Find$\displaystyle f'(a)$

$\displaystyle f(x)=\frac{8}{\sqrt{x+2}}$

This is what we have to start with.

$\displaystyle \frac{\frac{8}{\sqrt{a+h+2}}-\frac{8}{\sqrt{a+2}}}{h}$

I began multiplying by a common denominator to get rid of the complex fraction, then multiplied by a conjugate to get rid of the square roots. After that I don't know what to do.