HOW TO USE THIS APPLET

The slider area

The sliders change the parameters a, b and c in the quadratic function y = ax² + bx + c.

• Drag a slider to change the value of a parameter.
• The left and right arrow keys can be used to change the selected parameter [light blue].
• The up and down arrow keys can be used to increase or decrease the selected parameter. (Use this feature for fine adjustments.)
• If the arrow keys don't respond, click the cursor in the applet frame then try again.
• Drag a parameter scale to "move" it. (ie. Change the range but maintain the scale "length".)
• Drag towards or away from a parameter thumb to "re-scale" the scale.
• Select the corresponding parameter button to enter a value for a parameter.

The graph area

• Drag the vertex to move the parabola in the coordinate system.
• Drag a location along the axis of symmetry of the parabola (other than the vertex) to move the parabola only horizontally or vertically.
• Drag a location along the parabola (other than the vertex) to change the width of the parabola.
• THE SHIFT KEY : Click and drag in the graph area to move the entire coordinate system.
• THE CONTROL KEY : Click and drag in the graph area towards or away from the origin to change the x and y axis scale.
• THE CONTROL-SHIFT KEY : Click and drag in the graph area towards or away from the :
  - x-axis to change the y-axis scale.
  - y-axis to change the x-axis scale.

Other

• Use the "RESET" button to restore the applet to the initial state.

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