Second derivative help

**mathisfun26** · February 5th 2013, 09:39 PM

What's the second derivative of (12-3x)/sqrt(6-x)
Thanks I've been trying for a good amount of time and my answer doesn't compare to that of online derivatives calculators thanks

**Prove It** · February 5th 2013, 09:42 PM

Write it as $\displaystyle \begin{align*} \left( 12 - 3x \right) \left( 6 - x \right) ^{-\frac{1}{2}} \end{align*}$ and then apply the product rule. For the derivative of $\displaystyle \begin{align*} \left( 6 - x \right) ^{-\frac{1}{2}} \end{align*}$ you will need to use the chain rule also...

**mathisfun26** · February 5th 2013, 09:46 PM

I got -6/2(6-x)^3/2
I'm pretty sure I got the bottom portion right I'm not sure about the top

**ibdutt** · February 5th 2013, 09:53 PM

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