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 August 15th, 2007, 12:53 PM #1 Newbie   Joined: Aug 2007 Posts: 4 Thanks: 0 Please help me to solve this simple equation Hello Every one: I have the following equation f(t) = X/(1-e^(-t/Y)) where X and Y are unknown, and e^z stand for exponential of z (e power z). I know two points of this function. Lets says f(t1) = s1, and f(t2) = s2; where t1 and t2 are not zeros value. So we got two equations: s1 = X/(1-e^(-t1/Y)) and s2 = X/(1-e^(-t2/Y)) Two equations and two unknowns, we should be able to resolve these equations analytically, but I don't know how.... I should be fairly simple, but I am lost. Thanks for your help. Samantha[/i] August 15th, 2007, 04:21 PM #2 Global Moderator   Joined: May 2007 Posts: 6,807 Thanks: 716 It looks fairly difficult. The first step is easy. The ratio s1/s2 gets rid of X, so you have one equation for Y, but it looks pretty difficult after that. August 15th, 2007, 07:45 PM #3 Global Moderator   Joined: Dec 2006 Posts: 20,931 Thanks: 2205 It can't be done after that unless t1/t2 or t2/t1 is a small, simple value, such as 2 or 3. Tags equation, simple, solve Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post oravikiran Elementary Math 1 June 13th, 2012 09:04 AM sharp Algebra 1 December 12th, 2010 06:27 PM Fi87 Algebra 2 February 14th, 2010 08:40 PM falcon Algebra 3 December 11th, 2009 03:44 PM Samantha Abstract Algebra 0 December 31st, 1969 04:00 PM

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