1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Complex 2 variables and 2 unknown abstract question

  1. May 3, 2015 #1
    The overall question is on non steady fluid mechanics however the part on stuck on boils down to the two equations below, which I am unable to solve.

    X = 122.3 (2 - Y)

    Y= 0.18 * SQRT( 100 + X )

    the text states the equations are satisfied by Y = 1.903 and X = 11.82.

    To prove this isn't a homework I will upload a picture of the solution given.


    Attached Files:

  2. jcsd
  3. May 3, 2015 #2


    User Avatar
    2017 Award

    Staff: Mentor

    It is still like a homework question.

    If you solve the first equation for Y, square both equations and set them equal, you get a quadratic equation for X. Solving this gives the solutions for Y afterwards.
  4. May 3, 2015 #3
    The page its from is actually a question solution however they didn't explain how to solve that particle part.

    I did as you said earlier, however, the b^2-4ac section came out negative so I was unsure I was going in the right direction.

    Anyone able to advise?

  5. May 3, 2015 #4

  6. May 3, 2015 #5


    User Avatar
    2017 Award

    Staff: Mentor

    Then you have a calculation error somewhere, as the approach works.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Threads - Complex variables unknown Date
Simplification of a complex exponential Dec 10, 2017
Complex Proof Dec 1, 2017
Simplification of complex expression Nov 9, 2017
Modulus of a complex number with hyperbolic functions Oct 21, 2017
Functions of a Complex Variable Jan 8, 2012