Hi guys

I've been trying to solve this for a little while now but I feel kinda lost and I thought you could maybe help me out.

so

f(x)=x^2*e^(-3x)

f '(x)=?

Thank you.

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- January 6th 2010, 03:57 AMBlacklawDerivate f(x)=x^2*e*(-3x)
Hi guys

I've been trying to solve this for a little while now but I feel kinda lost and I thought you could maybe help me out.

so

f(x)=x^2*e^(-3x)

f '(x)=?

Thank you. - January 6th 2010, 04:01 AMdedust
- January 6th 2010, 04:12 AMBlacklaw
- January 6th 2010, 04:16 AMCaptainBlack
- January 6th 2010, 04:31 AMBlacklaw
- January 6th 2010, 05:24 AMtom@ballooncalculus
That's what the chain rule says.

Just in case a picture helps...

http://www.ballooncalculus.org/asy/chain.png

is the chain rule. Straight continuous lines differentiate downwards (integrate up) with respect to x, and the straight dashed line similarly but with respect to the dashed balloon expression (the inner function of the composite which is subject to the chain rule).

In this case...

http://www.ballooncalculus.org/asy/d...expMinusU1.png

PS:

Just in case another picture doesn't hurt (and in view of comments below)...

Wrapping the chain rule inside the (legs-uncrossed version of) ...

http://www.ballooncalculus.org/asy/prod.png

... the product rule, we get...

http://www.ballooncalculus.org/asy/d...expMinusU2.png

__________________________________________

Don't integrate - balloontegrate!

Balloon Calculus; standard integrals, derivatives and methods

Balloon Calculus Drawing with LaTeX and Asymptote! - January 6th 2010, 05:34 AMBlacklaw
I think I get it now.. Thank you very much for helping me out.

- January 6th 2010, 09:13 AMrshekhar.in

By chain rule

Hope this helps. - January 6th 2010, 09:23 AMCaptainBlack
- January 6th 2010, 09:26 AMCaptainBlack