some number help plz

Discussion in 'Random Topic Center' started by Chromecatz, Nov 4, 2007.

  1. Chromecatz

    Chromecatz New Member

    what number is -1.938E -6?
    i keep getting it in my graphing calculator whenever i get the minimum of the parabola.
    *im doing my Algebra 2 homework*
     
  2. Sandslash7

    Sandslash7 <a href="http://pokegym.net/forums/showpost.php?p=

    -0.000001938.

    The E means that it's Scientific Notation.

    In true Sci. Not: -1.938 * 10^-6.
     
  3. Marril

    Marril New Member

    It sounds like just a rounding error. Should be zero, but something got rounded off a tiny bit in the equation.
     
  4. Gir

    Gir New Member

    It's supposed to be zero. It will do that sometiems when you try to find the zeros too.
     
  5. Professor_Chris

    Professor_Chris Active Member

    Just use calculus instead. It's faster. :3
     
  6. Marril

    Marril New Member

    It's also easier.
     
  7. Professor_Chris

    Professor_Chris Active Member

    Much easier. Made me wish I had known calculus a long time ago.
     
  8. Pinsir52

    Pinsir52 New Member

    Calculus easier than algeber 2...i wish i was that smart...
    oh, and what they said.
     
  9. ShadowTogetic

    ShadowTogetic New Member

    Take its derivative, set it to zero, and you get an extrema.
     
  10. Professor_Chris

    Professor_Chris Active Member

    You actually get a point on the curve where the line tangental to the curve has a slope of 0. The only place a slope of the tangent line is 0 on a curve is where it changes directions. You can also tell if the curve is ascending or decending at a give point using the first derivative. Calculus is awesome like that.

    Finding the first derivative is easy too. For example, the derivative of y=x^2 is y'=2x and the first derivative of y=x^3 is y'=3x^2 while the derivative of any constant is 0.
     
  11. ShadowTogetic

    ShadowTogetic New Member

    or, use a program if you're just lazy

    f[x_]=function
    a[x_]=D[f[x],x];
     

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