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Posers and Puzzles

Posers and Puzzles

  1. 20 Feb '07 21:01 / 3 edits
    If xy*y + ty +z = 0,

    Find y.
  2. 20 Feb '07 22:43 / 1 edit
    Originally posted by GinoJ
    If xy*y + ty +z = 0,

    Find y.
    y= (-t +or- sqrt(t^2-4*x*z))/(2x) -the quadriatic formula



    correct?


    Edit: I forgot some brackets
  3. 20 Feb '07 22:47 / 1 edit
    The quadratic formula suggests 2 solutions.

    (-t - sqrt( t*t - 4*x*z)) / (2* x)
    (-t + sqrt( t*t - 4*x*z)) / (2* x)

    Derived by making a perfect square in order to remove the square function

    x*y*y + t*y + z = 0
    y*y + t*y/x + z/x = 0
    y*y + t*y/x = -z/x
    y*y + t*y/x + t*t/(4*x*x) = t*t/(4*x*x) - z/x
    (y + t/(2*x))^2 = t*t/(4*x*x) - z/x
    y + t/(2*x) = +- sqrt(t*t/(4*x*x) - z/x)
    y + t/(2*x) = +- sqrt((t*t - 4*x*z)/(4*x*x))
    y + t/(2*x) = 1/(2*x)*+- sqrt(t*t - 4*x*z)
    y= -t/(2*x) +- sqrt(t*t - 4*x*z)/(2*x)
    y= (-t +- sqrt(t*t - 4*x*z))/(2*x)
  4. 21 Feb '07 01:09
    Originally posted by geepamoogle
    The quadratic formula suggests 2 solutions.

    (-t - sqrt( t*t - 4*x*z)) / (2* x)
    (-t + sqrt( t*t - 4*x*z)) / (2* x)

    Derived by making a perfect square in order to remove the square function

    x*y*y + t*y + z = 0
    y*y + t*y/x + z/x = 0
    y*y + t*y/x = -z/x
    y*y + t*y/x + t*t/(4*x*x) = t*t/(4*x*x) - z/x
    (y + t/(2*x))^2 = t*t/(4*x*x) - z/x
    y + t/(2*x ...[text shortened]... +- sqrt(t*t - 4*x*z)
    y= -t/(2*x) +- sqrt(t*t - 4*x*z)/(2*x)
    y= (-t +- sqrt(t*t - 4*x*z))/(2*x)
    i don't even know who you are or where your from but i cn tell from your above post that you really really need to get out more and that your single
  5. 21 Feb '07 03:17
    Originally posted by iraqi insurgent
    i don't even know who you are or where your from but i cn tell from your above post that you really really need to get out more and that your single
    Perhaps you should stay in a day and study grammar.
  6. 21 Feb '07 05:17
    Originally posted by GinoJ
    If xy*y + ty +z = 0,

    Find y.
    (x)y*y + (t)y + (z) = 0
    m*m = t*t - 4xz
    (-t +/- m)/2x=y