Hello,

I have the following equation:

v1/v2 = R2/R1+R2

How do we solve for R2?

I don't know how to isolate R2 on one side of the equation. All help is appreciated?

thanks

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- March 4th 2013, 10:10 AMsimplyComplexDon't know how to factor?
Hello,

I have the following equation:

v1/v2 = R2/R1+R2

How do we solve for R2?

I don't know how to isolate R2 on one side of the equation. All help is appreciated?

thanks - March 4th 2013, 10:29 AMPlatoRe: Don't know how to factor?
[QUOTE=simplyComplex;773431]I have the following equation:

v1/v2 = R2/R1+R2

How do we solve for R2?/QUOTE]

Is it

Because you actually posted

Which is it? - March 4th 2013, 10:53 AMHallsofIvyRe: Don't know how to factor?
If it is , start by multiplying both sides by to get .

If it is , start by writing as so you have and now multiply by . - March 4th 2013, 11:47 AMsimplyComplexRe: Don't know how to factor?
Ooops I'm sorry.... Its:

v1/v2 = R2/(R1 + R2)

Quote:

start by multiplying both sides by v2(R1 + R2) to get....

v1/v2 = R2/(R1 + R2)

so when you say cross multiply... do you mean like this:

(R1 + R2) (v1/v2) = (R2/(R1+R2)) (v2)

v1(R1 + R2) = R2v2

v1R1 + v1R2 = R2v2

So now, R2 is on both sides, what I really need is to isolate R2 on one side!!!!

So what is the next step?

thanks - March 4th 2013, 12:14 PMsimplyComplexRe: Don't know how to factor?
Okay I think I got it:

v1/v2 = R2/(R1 + R2)

(R1 + R2) (v1/v2) = (R2/(R1+R2)) (v2)

v1(R1 + R2) = R2v2

v1R1 + v1R2 = R2v2

v1R1 = R2v2 - v1R2

v1R1 = R2(v2 - v1)

v1R1/(v2-v1) = R2(v2 - v1)/ (v2 - v1)

R2 = v1R1/(v2-v1)

Thanks!