Quad 2000 v1.9 (Q2000.85P)
12/26/96

Quadratic Equation Solver
By M. Smolens <webster@voicenet.com>
Factoring portion by Peter Kolbus <pkolbus@mailhost.net>

Simple description:
  Quad 2000 takes a quadratic equation and is able to find out a lot
  of stuff about it: x-intercepts, y-intercept, its factors, etc. It can
  solve for either x or y, and also graph the function.

Detailed description:
  You give Quad 2000 the three coefficients A, B, and C of a quadratic
  equation in the form of y=Ax+Bx+C.  Quad 2000 is then able to find the
  x intercepts of the parabola (solve the quadratic equation for x), find
  the factors, find the vertex, and graph.  You can also input a value
  for either y or for x and Quad 2000 will solve for the other variable
  quickly.

  Quad 2000 will display the quadratic equation that you give it in one of
  two ways.  The default way is in Ax+Bx+C form (i.e. 3x-7x+5).  If you
  would like Quad 2000 to display the coefficients A, B, and C without the
  x's, you can select the option to do so (hit MORE at the credits screen
  which is displayed when Quit is pressed).  In that case, the coefficients
  will be displayed on seperate lines with A=, B=, and C= preceding the
  numbers.  This second display option will also occur automatically if
  the equation in Ax+Bx+C will not fit completely on one line.

  Quad 2000 can also quickly graph the parabola.  After graphing, you may
  also zoom in, zoom out, standard zoom, zoom so the x-step is every
  integer, adjust the range, zoom to fit the parabola in a nicely sized
  window, and use the Trace function to find points on the parabola.
  There is an option included to adjust the default preliminary graph
  display.  It can be set either to standard zoom or zoom to fit.

The Menu Buttons:
    First Menu:
        [ x-ints ] 
          Finds the x intercepts of the parabola.  Displays both the real
          and imaginary parts.
        [ Fact ]
          Factor the quadratic.  Thanks to Peter Kolbus <pkolbus@mailhost.net>
        [ Vrtx ]
          Finds the x and y coordinates for the vertex of the parabola.
        [ Graph ]
          Graphs the parabola and switches to Graph menu.
        [ ---> ]
          Jumps to second menu.

    Second Menu:
        [ <--- ]
          Jumps to first menu.
        [ y-->x ]
          Input a y value and receive the two x values on the parabola.
        [ x-->y ]
          Input an x value and receive the y value on the parabola.
        [ ABC ]
          Set new values for the A, B, and C coefficients.
        [ Quit ]
          Quits Quad 2000.

    Graph Menu:
        [ AutoZ ]
          Uses ZFit to adjust the range to a nice viewing window.
        [ Range ]
          Change the range manually.
        [ Zoom ]
          Changes to Zoom menu.
        [ Trace ]
          Use arrow buttons to find different points on the parabola.
          Hit Enter to return to Graph menu.
        [ ---> ]
          Returns to first menu.

    Zoom Menu:
        [ <--- ]
          Returns to Graph menu.
        [ ZIn ]
          Zooms in.
        [ ZOut ]
          Zooms out.
        [ ZStd ]
          Zooms standard.
        [ ZInt ]
          Zooms so that the x values are integers.

Quad 2000 is more than just a simple quadratic equation solver, but it's
still very easy to use.

Quad 2000 is Copyright 1995-96, M. Smolens.
