Derivative

**Oldspice1212** · October 23rd 2012, 06:02 PM

Find the derivative for these:

y = 6xe^{−kx

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

y =

5 + 2e^8x

(square root the whole equation)
This one I'm not entirely sure how to do, maybe (a-b)^2?

**richard1234** · October 23rd 2012, 06:33 PM

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 $(a-b)^2$ ...

**Oldspice1212** · October 23rd 2012, 06:38 PM

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)?

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