# Math Help - Derivative

1. ## Derivative

Could you show me how to find derivative of $f(x)=\dfrac{5}{\sqrt{x}}$ ?

2. Originally Posted by Bernice
Could you show me how to find derivative of $f(x)=\dfrac{5}{\sqrt{x}}$ ?
Rewrite as $f(x)=5x^{-1/2},$ and then use the power rule.

3. Rewrite as $f(x)=5x^{-1/2},$ and then use the power rule.
So, will it be: $\frac{-5\sqrt{x}}{2x^2}$

4. Yes, but I think it's also acceptable to write it (and generally would more often be written) as $-\frac{5}{2x^{\frac{3}{2}}}$ (although the positioning of the negative sign is irrelevant >.>)