solve (1/R) = (1/S) + (1/T) for R

[snakeyesxlaw]

Solve for R.

(1/R) = (1/S) + (1/T)

R =
[Your solution should involve the variables S and T.]

// okay, this is how i went about this

common denominator

(ST/RST) = (RT/RST) + (RS/RST)

(ST) / 2(T+S) = R

any suggestions?

 

[Deleted member 4993]

Re: solve for variable problem..

Solve for R.


(1/R) = (1/S) + (1/T)



R =
[Your solution should involve the variables S and T.]


// okay, this is how i went about this

common denominator

(ST/RST) = (RT/RST) + (RS/RST)

(ST) / 2(T+S) = R.....Where did the 2 come from?

any suggestions?

 

[stapel]

Solve for R: (1/R) = (1/S) + (1/T)

...any suggestions?

:idea: Try multiplying through on both sides by the common denominator. This should give you:

. . . . .ST = RT + RS

Factor out of the R on the right-hand side, and divide through by what's left. :wink:

Eliz.

 

[Denis]

Or you can lcd the right side:
1/R = (S+T) / (ST)

Flip that over and you're done :idea: