Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.



Re: Solving equation
Posted:
Apr 4, 2008 6:37 PM


roberson@ibd.nrccnrc.gc.ca (Walter Roberson) wrote in message <ft694d$5ki$1@canopus.cc.umanitoba.ca>... > In article <ft67km$agj$1@fred.mathworks.com>, > Wouter Geelen <wouser_geelen@hotmail.com> wrote: > > >I tried to do this myself but I can't get it done. I got > >the following equation. > > >Ti = 1200*exp(1/7200*t)+1200 > > >Now I want to solve this function for Ti = 1080. So what I > >want to find is t. How do I do that :? > > Ti = 1200*exp(1/7200*t)+1200, so > Ti  1200 = 1200 * exp(t/7200), so > (1200  Ti)/1200 = exp(t/7200), so > ln((1200  Ti)/1200) = t/7200, so > ln(1200/(1200Ti)) = t/7200, so > t = 7200 * ln(1200/(1200Ti)) > > Substituting in Ti = 1080, we get the result 7200 * ln(10) > which is about 16578.61267. > >  > "Is there any thing whereof it may be said, See, this is new? It hath > been already of old time, which was before us."  Ecclesiastes
Hahahaha yeah I know it can be done by algabra I already did myself lol but how do I this in matlab? Ain't there a function solve equation for paramater x?!? Or something like maple has?



