# Flipping a formula

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#### vgjako

Hi,

This is my first post here on diyAudio. I have trouble getting flipped the formula shown below, with respect to U3:

Regards
Vegard Jakobsen

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• klirrfaktor.png
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#### SY

U3 = sqrt((k2U12/100) - U22)

#### DF96

The 100 should be 100^2 in SY's solution.

Ooops.

#### vgjako

U3 = sqrt((k2U12/100) - U22)

I realized that something was not right with SY's solution.

Anyway, I managed to solve the task. I just have to thank for the help from both the SY and DF96.

Best Regards

#### AndrewT

There are two general rules for re-arranging a formula.

A multiplying factor moved to the other side becomes a divisor. And vice versa.

An adding factor moved to the other side becomes a subtractor. And vice versa.

Last edited:

#### DF96

Very minor correction: if it adds/subtracts it is a term, not a factor.

(I once had to write an expression parser (for real, not an exercise) and these distinctions became very important then. In normal life they are much less important, but as algebra seems to confuse most people it may help if we give things consistent names.)

#### AndrewT

Thank you, I should have known better.
Term is the correct word. Sorry for the confusion.

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