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 Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

 September 2nd, 2013, 12:01 AM #1 Newbie   Joined: Sep 2013 Posts: 2 Thanks: 0 Help reversing formula Hi everyone, Not sure if I posted this in the right section, but let's say I have the following formula: Code: (a * 10d) / (g * r) - (u - 0.5d) * (g * 0.002d) Now let's say I know the result of that equation, how would I go about determining the value of u? September 2nd, 2013, 02:30 AM #2 Senior Member   Joined: Aug 2011 Posts: 334 Thanks: 8 Re: Help reversing formula It is not an equation since where is no "=" in it. So, one cannot solve it nor "reverse" it until it will be written as an equation must be written. September 2nd, 2013, 02:46 AM   #3
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Re: Help reversing formula

Please forgive me Let's say the equation was

Quote:
 value = (a * 10d) / (g * r) - (u - 0.5d) * (g * 0.002d)
And I know value, how can I determine u? September 2nd, 2013, 04:04 AM #4 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1039 Re: Help reversing formula OK; so you have: v = (a * 10d) / (g * r) - (u - 0.5d) * (g * 0.002d) same as: v = 10ad / gr - (u - d/2)(dg / 500) do the multiplication: v = 10ad / gr - dgu / 500 + d^2 g / 1000 Only one term contains the "u"; so easy to wrap up...do you want the "satisfaction" of finishing it?  September 2nd, 2013, 04:08 AM #5 Senior Member   Joined: Aug 2011 Posts: 334 Thanks: 8 Re: Help reversing formula is it : value =((a * 10d) / (g * r)) - ((u - 0.5d) * (g * 0.002d)) or value = (a * 10d) / ((g * r) - (u - 0.5d) * (g * 0.002d)) ? Supposing that the equation is : value =((a * 10d) / (g * r)) - ((u - 0.5d) * (g * 0.002d)) (u - 0.5d) * (g * 0.002d) = ((a * 10d) / (g * r)) - value (u - 0.5d) = ? u = ? Tags formula, reversing 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 Vidofner Applied Math 4 January 12th, 2014 08:47 AM Liqwde Computer Science 2 August 31st, 2010 08:59 PM OSearcy4 Calculus 4 October 17th, 2009 03:32 PM Gotovina7 Calculus 1 February 29th, 2008 09:30 AM Cat Number Theory 6 January 7th, 2007 07:32 PM

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