Exponential problem derivative

**qhdus** · October 27th 2010, 11:55 PM

I can't seem to get the right answer for this problem (finding the derivative):

$\overline{c} = \frac{890}{q} + 3600 \cdot \frac{e^{(2q+4)/840}}{q}$

Help would be greatly appreciated.

**TheCoffeeMachine** · October 28th 2010, 10:49 AM

What is $\overline{c}$ ? If we assume that it's just functional notation, then:

$\overline{c}' = -\frac{890}{q^2}+3600\cdot \frac{e^{\frac{q+2}{420}} (q-420)}{420 q^2}$ using the chain rule on $e^{\frac{2q+4}{840}$ .

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