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**rvdude****Member**- Registered: 2012-10-24
- Posts: 3

Here is my problem:

w squared = (1/LC) - (R squared / L squared)

I need to solve for the variable L.

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,832

Hi;

I am assuming this is what you want to solve:

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**rvdude****Member**- Registered: 2012-10-24
- Posts: 3

This is very interesting because your first equation with the "1 +" gives me an incorrect value, but your second equation with the "1 -" gives me the correct value!!! So I'm surmising that the 2nd equation is the correct one that will always work??? And, could you please direct me to the type of math you used to obtain your results? Is this algebra, calculus or what???

And thank you very much for your help!!

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**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 103,832

Hi;

Every quadratic equation has two solutions. In math they both apply and there is no reason to favor one over the other. In practical problems one answer may be ridiculous. Like getting a negative area or a negative weight. It is not necessarily true that one answer will always be the only one.

This is called algebra.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.** **A number by itself is useful, but it is far more useful to know how accurate or certain that number is.**

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**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,608

Yes, Quadratic Equations are like that. See the first example here: Mathematical Models 2

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

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