# Second derivative help

• Feb 5th 2013, 09:39 PM
mathisfun26
Second derivative help
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
• Feb 5th 2013, 09:42 PM
Prove It
Re: Second derivative help
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...
• Feb 5th 2013, 09:46 PM
mathisfun26
Re: Second derivative help
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
• Feb 5th 2013, 09:53 PM
ibdutt
Re: Second derivative help