I have an equation in the form y=10^x, i have an error in x, dx. I am unsure how to find the associated error in y. dy=10^dx gives to small an error and dy=x-dx doesn't seem logical as a smaller error in x gives a bigger error in y.

(The actual equation is d=10^((m(v)-M(v)+5)/5), i have already have errors for m(v) and M(v) and have combined them by using sqrt(dM(v)^2+dm(v)^2), the equation is used for calculating cosmoligical distances).

tiny-tim
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I have an equation in the form y=10^x, i have an error in x, dx. I am unsure how to find the associated error in y.

Hi Jack_O! (try using the X2 tag just above the Reply box )

Hint: just differentiate … if y = 10x, then dy = (what)dx ? Hi tiny-tim, doesn't bode well that i had to look up the differential of 10x Anyhoo i know get my error in y as 10xln(10)dx, which gives me a much more reasonable answer, thanks for your help tiny-tim
Hi tiny-tim, doesn't bode well that i had to look up the differential of 10x Hi Jack_O! Quick trick: 10x = (eln10)x = exln10 