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- >2.Graph of the quadratic function
- y=x^2µ-4
- MYSZEK 2xyDEMO
- EXAMPLE
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- ;enter the formula
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- ;vertex
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- ;enter-finished
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- ;1st point
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- ;next example
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- BLURB
- 1`#We are going to draw a graph
- 1`#of the quadratic function:
- 1`#@y=x^2≤-4@
- 1`#We click the icon to open the
- 1`&graphs of functions& window
- 12`The information about what to do now is
- 12`displayed below the title of the window
- 2`Following this hint, we write the formula for the value of the function.
- 3`When finished, we press &ENTER&
- 4`Now we should write the co-ordinates
- 4`of some points on the parabola.
- 5`First we should write co-ordinates of the &vertex& of the parabola.
- 5`In our case it is the point $"x=0"$ , $"y=-4"$.
- 6`The remaining 2 points can be arbitrary.
- 6`For exmple, we can choose the zero-points of the function.
- 7`Having introduced all the points,
- 7`we press &ENTER&.
- 8`Now, following the hint
- 8`below the title of the window,
- 8`we should select a point.
- 8`We click on a column of the
- 8`table to do that...
- 9`and mark the point in the co-ordinate diagram.
- 10`#In the same way we mark all of the points.
- 10`#The hints below the title of the window
- 10`#remind us what to do.
- 11`When the points are marked, the graph appears automatically.
- 100`#We show how to use 2xy to draw graphs of functions.
- 100``#"The presentation proceeds automatically."`
- 101`#In a moment the &Examples& window will appear.
- 101`You can watch the same presentation again,
- 101`#or load the next example,
- 101`#or close the window and solve your own problem.
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