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This question integral thingy


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#1 lynnie

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Posted 21 February 2007 - 09:42 PM

don't uderstand this one, integral.gif 2/x power2.gif dx

any help would be great thanks.

#2 John

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Posted 21 February 2007 - 09:44 PM

It's just a standard Integral, rearrange the fraction so you have no x terms on the bottom

#3 lynnie

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Posted 21 February 2007 - 09:52 PM

QUOTE(John @ Feb 21 2007, 09:44 PM) View Post
It's just a standard Integral, rearrange the fraction so you have no x terms on the bottom

so its then becomes... integral.gif 2x [^-2] dx

then i become stuck

#4 John

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Posted 21 February 2007 - 09:57 PM

Do integration as normal

You have general form:

integral.gif axn

= axn+1 / n+1

Understand?

#5 lynnie

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Posted 21 February 2007 - 10:06 PM

no :-(

Im just not a maths person, but it's compulsory to do you see.

#6 John

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Posted 21 February 2007 - 10:08 PM

What you do is increase the power of the x term by 1, then you divide the x term by the new power to get the integral.

#7 Calum MFC

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Posted 22 February 2007 - 08:05 PM

you would do it like this:

integral.gif 2/x power2.gif
=integral.gif 2x[^-2] (bring x term up)
=2x[^-1] / -1 (integrate - increase power by 1 then divide by new power)
=-2x[^-1] (get rid of the (-1) on the bottom)


i'm pretty sure rolleyes.gif

#8 Calum MFC

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Posted 22 February 2007 - 08:08 PM

correct me if im wrong please wink.gif

#9 John

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Posted 22 February 2007 - 08:31 PM

Yes, you are correct.





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