Can I change the base number in y=c*b^x ?

• Nov 16th 2012, 03:37 AM
publicvoid
Can I change the base number in y=c*b^x ?
Hi,
I have some data (x,y) and I plotted its graph in excel, and added a trendline which is defined by
$y = c*exp(x)$
but my claim was $y = c * 2^x$ and I don't know how to make the line equation power of 2 instead of e.
So, does this (exp) equation implies that my claim was true?
I mean is it sufficient to show $y = c * (some\_base)^x$?
• Nov 16th 2012, 04:10 AM
chiro
Re: Can I change the base number in y=c*b^x ?
Hey publicvoid.

Recall that (e^ln(a))^x = a^x = e^(x*ln(a)) so using a substitution z = x*ln(a) you can get a^x by using f(z) = e^z where z = x*ln(a).