Homework Help: Property of logarithms

Posted by Jen on Friday, October 20, 2006 at 9:51pm.

Using property of logarithms, how do I prove derivative of ln(kx) is 1/x

First observe that ln(kx) = ln(k) + ln(x) then take derivatives. The ln(k) is simply a constant so it goes away. You could also derive it as
d/dx ln(kx) = 1/kx * k by the chain rule.

To see that the derivative of ln(x) is 1/x here's a brief proof.
If you have y=ln(x) then
e^y=x Now find dx/dy to get
dx/dy = e^y because
d/dy e^y = e^y
So 1/dx/dy = dy/dx = 1/e^y = 1/x

This assumes that you know
d/du e^u = e^u which is easier to derive from the definition than d/dx ln(x).

what are you doing please give alghorthm problums

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