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September 2nd, 2013, 12:01 AM   #1
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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?
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September 2nd, 2013, 02:30 AM   #2
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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.
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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?

Thanks in advance
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September 2nd, 2013, 04:04 AM   #4
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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?
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September 2nd, 2013, 04:08 AM   #5
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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 = ?
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