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#1

$Old$ 12-01-2008, 06:55 AM

dankelly07 $dankelly07 is offline$

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$Default$ Integration problem

Ok how shall i go about this one..

I = (x^2)*(e^(x^3))

I know the rule:

I = f(x)^n*f'(x)dx = 1/n+1*f(x)^(n+1) + C

I cant quite see how it fits with this particular problem..

Can anyone help...

Skype Wondering

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#2

$Old$ 12-01-2008, 06:59 AM

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Originally Posted by dankelly07 $View Post$

Ok how shall i go about this one..

I = (x^2)*(e^(x^3))

I know the rule:

I = f(x)^n*f'(x)dx = 1/n+1*f(x)^(n+1) + C

I cant quite see how it fits with this particular problem..

Can anyone help...

Skype Wondering

I think it would be quite clear if you substituted $u=x^3$ , $du=3x^2~dx$

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#3

$Old$ 12-01-2008, 07:26 AM

dankelly07 $dankelly07 is offline$

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Ah that was alot easier than I thought

This is the rule I needed...

I = f'(x)*e^f(x)dx = e^(f(x)) + c

Thanks alot

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