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September 21, 2014

September 21, 2014

Posted by **Amelia** on Saturday, November 7, 2009 at 9:25am.

ln x / 5x-7

and

e^x / 2x^3 - 1

could you help me out with the first and just point me in the right direction for the first i cant seem to get the steps in the right order and then it gets all muddled

thank you

A!

- maths -
**bobpursley**, Saturday, November 7, 2009 at 10:08amlet u= e^x v=(5x-7)

du/dx=e^x dv/dx= 5

f= uv^-1

f'= u d(v^-1)/dx+ v^-1 du/dx

f'= -uv^-2 dv/dx + v^-1 e^x

so...

f'=-5e^x/(5x-7)^2+ e^x/(5x-7

check that.

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