hi ya!! im a little stuck with the last part, i cant see where 2 get the answer from.
i) y= log10x so that x= 10y
show x can be written in form eyln10. (can do that bit!)
ii)ans : dx/dy = ln10 eyln10
iii) hence show that the derivative of log10x withr espect to x is 1/(xln10).
hope that makes sense, thank u 4 help!!
Turn on thread page Beta
logs -sorry 2 ask so many Qs!! watch
- Thread Starter
- 03-06-2005 16:02
- 03-06-2005 16:05
You have dx/dy = ln10 eyln10, which you can re-write as:
dx/dy = ln10 eln(10^y)
= ln10 . 10^y
= ln10 . x
d(log10x)/dx = dy/dx
= 1/(x ln10)