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an actual math question

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02-15-2010 , 06:32 PM

noname6520

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Join Date: Feb 2008 Posts: 3,414

Im in calc 2, doin homework and I can't figure this out.

How do I find the integral of:

2(pi)(x)[sqrt(x)-(4x-3)]

I guess I dont know how to take the integral of square root x times x....idk.

btw answer is (17pi)/5

thanks in advance

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02-15-2010 , 06:45 PM

mehike

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Join Date: Mar 2007 Posts: 115

x*sqrt(x)=x^(3/2)

so that should make things pretty easy.

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02-15-2010 , 06:53 PM

noname6520

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Join Date: Feb 2008 Posts: 3,414

here lets change it because I already tried doing that and still I am not getting the right number.

the limits of integration are 1, 0.

the answer is as posted in op.

I just cant seem to get it.

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02-15-2010 , 07:04 PM

mehike

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Join Date: Mar 2007 Posts: 115

looks like your answer is wrong to begin with.

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02-15-2010 , 07:24 PM

noname6520

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Join Date: Feb 2008 Posts: 3,414

ok thanks. I figured it out.

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02-15-2010 , 07:25 PM

mehike

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Join Date: Mar 2007 Posts: 115

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02-15-2010 , 07:26 PM

mehike

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Join Date: Mar 2007 Posts: 115

little late I guess :P

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