# Derivative

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• October 23rd 2012, 07:02 PM
Oldspice1212
Derivative
Find the derivative for these:

y
= 6xekx

So for this I'm getting 6-ke^x

y =
 http://www.webassign.net/wastatic/wa...img/sqrt2a.gif 5 + 2e8x
(square root the whole equation)
This one I'm not entirely sure how to do, maybe (a-b)^2?

• October 23rd 2012, 07:33 PM
richard1234
Re: Derivative
Your question's pretty unclear, but I'm assuming you want to find dy/dx?

For the first one, you have to use the product rule:
$\frac{dy}{dx} = 6(e^{-kx} + x(e^{-kx})(-k))$, then simplify.

The second one's just a chain rule problem. I don't know what you're referring to when you say $(a-b)^2$...
• October 23rd 2012, 07:38 PM
Oldspice1212
Re: Derivative
Sorry about that, it's fixed, yes it was to find the derivative for these questions :P

So is the first one e^-kx(6-6kx)?