# Math Help - derivatives

1. ## derivatives

this is a little overwhelming

where to start?

y= [(e^x + e^pi)*(fourth root (x + 2))] / sqrt(x^2 + 7)

product rule? quotient rule? power rule? chain rule? agh!

2. Originally Posted by buttonbear
this is a little overwhelming

where to start?

y= [(e^x + e^pi)*(fourth root (x + 2))] / sqrt(x^2 + 7)

product rule? quotient rule? power rule? chain rule? agh!
It might help if it's in a readable form...

$y = \frac{(e^x + e^\pi)(x + 2)^{\frac{1}{4}}}{(x^2 + 7)^{\frac{1}{2}}}$.

OK, to start, it is a quotient, so start off with the quotient rule.

$\frac{dy}{dx} = \frac{(x^2 + 7)^{\frac{1}{2}}\,\frac{d}{dx}\left[(e^x + e^\pi)(x + 2)^{\frac{1}{4}}\right] - (e^x + e^\pi)(x + 2)^{\frac{1}{4}}\,\frac{d}{dx}\left[(x^2 + 7)^{\frac{1}{2}}\right]}{\left[(x^2 + 7)^{\frac{1}{2}}\right]^2}$.

Can you go from here?

3. um, i apologize that i didn't have time to learn how to type in math symbols before i had the question..

i guess i can try it, thanks.