Use the same equation that
we started with:
1. Enter the equation in Y1. Make sure that your plots
are turned off. |
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2. Press graph and adjust the window if
necessary. You should be able to see
the vertex and all intercepts. Zoom-6 or Zoom-0 may
help. The window settings for
the graph as shown on the right are: xmin=-7, xmax=7 ymin=-7, ymax = 7 |
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3. Press 2nd-Trace to get the
Calculate menu. Choose number 3 since our
vertex for this graph is the minimum point. You will need to define
an area of the graph. Once this area
is defined, the calculator will give you the minimum point for that area. |
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4. Use the left or right blue arrow keys to
move the flashing cursor to the left of the vertex and press ENTER to mark
the left bound. |
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5. Move the flashing cursor to the right of
the vertex and press ENTER to mark the right bound. Notice the arrow marks at
the top of the screen showing the area that you defined. |
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6. Press ENTER when asked Guess? The calculator will
display the x- and y-coordinates of the vertex. The coordinates are: (-1, -4) |
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If the vertex is the
maximum point as shown in the graph of , you only need to change one step. |
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In the calculate menu,
you will choose number 4: maximum. Work through the process
to make sure that you can get the coordinates of (1, -2) |
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