derivative problem

**LovesMeTrike** · Sep 17th 2009, 03:52 PM

Hello I'm trying to figure out how to do this problem

$d\frac{3}{\sqrt{t^2-4t}}$

Do I use the quotient rule and then chain rule when deriving the denominator?

**Mush** · Sep 17th 2009, 04:22 PM

Originally Posted by LovesMeTrike

Hello I'm trying to figure out how to do this problem

$d\frac{3}{\sqrt{t^2-4t}}$

Do I use the quotient rule and then chain rule when deriving the denominator?

What is d? Does it just mean derivative?

If so, then use the chain rule, yes.

Write it as $3 (t^2-4t)^{\frac{-1}{2}}$ and use chain rule.

**LovesMeTrike** · Sep 17th 2009, 04:53 PM

ok I got to $3(\frac{-1}{2})(t^2 - 4t)^{1/2}(2t-4)$

The answer to the problem is $\frac{-3(2t-4)}{2\sqrt{t^2 - 4t}^3}$

Where did I go wrong?

**LovesMeTrike** · Sep 18th 2009, 01:56 PM

Yes the d just meant derivative

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