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Homework Help: How to find one value in terms of other variables?

  1. Oct 26, 2014 #1
    1. The problem statement, all variables and given/known data

    I need to find q in terms of f and p.

    2. Relevant equations
    I am dealing with this equation at the moment:
    1/p + 1/q = 1/f.

    3. The attempt at a solution
    I think I should isolate the q, so that I have the variables p and f on one side of the equals sign, and q on the other side of the equals sign.

    Am I correct in thinking this?
  2. jcsd
  3. Oct 26, 2014 #2


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  4. Oct 26, 2014 #3
    My results:

    1/q =(1/f) - (1/p)

    1/q= (p-f)/(pf)

    q= pf/(p-f)

    Are they correct?
  5. Oct 26, 2014 #4


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