Question about Texas Instruments TI-84 Plus Silver Edition Graphic Calculator

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GRAPHING PROBLEM! I HAVE A MIDTERM TOMORROW AND I NED IT TO WORK!

Every time i go to graph a parabola, i press"y=" and i type in my formula. but when i hit graph a message pops up that says "ERR: INVALID DIM". i dont know what to do. i think it might have something to do with the "Plot1", "Plot2", and "Plot3", being highlited. PLEASE HELP ME!!!!!!

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Make sure all plots are off.  to do this, 2nd-Y=.  Highlight selection 4 (PlotsOff), and press enter twice.  It should say Done.
Next, press the ZOOM button, and select number 6 (ZStandard).  This will restore your window settings to default.
If those fail, press 2nd-+ to bring up the Memory menu.  Press 7 (Reset), and select Default.  This will not delete anything, it will just restore your settings.

Posted on Jan 28, 2009

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Minimum or maximum value of a parabola


Follow these steps: graph the parabola and after that 2nd then CALC keypad. To find extreme value of the function select 3: min or 4: max options. Select the function and set left bound, right bound(using left and right arrows) by pressing ENTER. You can see images bellow for all these steps for the y=-2x^2+5x+3

1. step: graphing parabola
3_9_2012_7_34_06_pm.jpg

2. step: left or lower bound
3_9_2012_7_36_01_pm.jpg

3. step: right or upper bound
3_9_2012_7_37_33_pm.jpg

4.step: extreme value of the function
3_9_2012_7_39_04_pm.jpg

Mar 08, 2012 | Texas Instruments TI-84 Plus Silver...

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How do I graph a boolean variable on my TI-89? When i input the x< or x> values, the graph just doesnt appear.


Enter the formula as an equality. Then, with the cursor on the formula, press 2ND [F6] to select Style. Choose "Above" or "Below" depending on which side of the graph you want shaded. Then press diamond [GRAPH] as usual to see the graph.

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My fx-9750GA PLUS wont graph lines, cicles or paraballas


Sure it does! Did you ask it to graph?Here are some screen captures to help you find your way.
To draw functions (regular, parametric, polar, sequences) use the application graph: Highloghted on 1st screen capture. The second screen captures shows you the functions y=f(x). enter a legal expression and press F6 Draw. To set TYPE press the key under TYPE.

k24674_100.jpgk24674_101.jpg

To draw conics (circles, parabolas, hyperbolas, and ellipses) use the CONiCS applications. (See 3rd screen ). On 4th capture the equation highlight is one for the parabola. y=x^2

k24674_102.jpgk24674_103.jpg

Scroll down or up examining the small graphs. They will show you which equation form to choose.
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k24674_104.jpg

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When I'm entering a quadratic function, I'm getting the graph of something that is not a parabola like it should be. However, when I graph x^2 by itself, it looks the way it should. What can I do to fix...


The actual graph depends on the constants (parameters) that are in the equation. Try playing with the dimensions of the window by zooming in or zooming out.
The most interesting part of the graph is the region near the maximum or minimum.
Here is a graph of the function y=X^2-5X 13 when drawn with standard window dimensions
3b585d8.jpg
Not very revealing. However if you press the Zoom key and select [2:ZoomIn] you see this (no changes) but the calculator is ready to accept your input concerning the new center of the graph.
bcd4c3e.jpg
At this stage, use the Arrow keys to move the center of the graph to another point as in the next screen capture.

0e09736.jpg
Notice the new center as a sign on the screen and its coordinates at the bottom. By pressing [ENTER] you get this
fc695b8.jpg
If you keep Zooming in you may end up having something that does not look like a parabola anymore.
4ea7132.jpg

To summarize: Use the Zoom In or Zoom Out functions or find where the minimum/maximum is, center the graph on that point and modify the windows dimensions (Xmin, Xmax, Ymin, and Ymax) so as to get as much of the interesting part of the graph as possible.

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The truth of the matter is that the curve drawn (the parabola) is the graph that you are seeking.
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Parabolas are forms of X^2. Go to [Y=], then put in the formula of the parabola that you want.

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I'm having the same problem and I tried turning off one of these stat plots but turns out I don't know how to do it, or how to tell if I did or not. Help please?
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