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Can anyone provide some information for this formula?

I tried rationalizing the denominator and cross multiplication and combining terms, and also multiplying by the conjugate of the demoninator, what am I doing wrong?

[tex]f(x) = \frac{1}{\sqrt{x + 2}} \; \; \; \text{find} \; f'(a)[/tex]

[tex]f'(a) = \lim_{h \rightarrow 0} (\frac{1}{\sqrt{(a + h) + 2}} - \frac{1}{\sqrt{a + 2}}) \frac{1}{h}[/tex]

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# Irrational denominator limit derivative

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