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RSS  Maths revision, coursework or discussion you will find help in here.
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Old 12-05-2008: 12th May 2008 15:39 #1 
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Default differentiation
 
it would be great if some one could help me out here!

i have to differentiate an equation involving a fraction. So i alrteady know you have to simplify it. the fraction is

-5/x^4

does that simplify to -5x^-4 or +5x^-4?

my ad maths gcse is tomorrow, and its suffice to say im a little bit behind with revision.......

thanks in advance
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Old 12-05-2008: 12th May 2008 15:41 #2 
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Default Re: differentiation
 
-5x^{-4} is correct.
Old 12-05-2008: 12th May 2008 15:45 #3 
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Default Re: differentiation
 
And the differentially thingy of that is:

20x^-5

Last edited by Olibert : 12-05-2008 at 15:50.

Old 12-05-2008: 12th May 2008 15:46 #4 
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Default Re: differentiation
 
Originally Posted by Olibert
And the differentially thingy of that is:

20x^-3
No it isn't. You need to minus 1 from the power not add 1.
 
Old 12-05-2008: 12th May 2008 15:50 #5 
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Default Re: differentiation
 
Oh snap can never remember which way it is.
Old 12-05-2008: 12th May 2008 15:52 #6 
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Default Re: differentiation
 
cheers guys
 
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