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How do I graph parabolas?

How do i graph a parabola on a ti-83 graphing calculator?

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Parabolas are forms of the base equation X^2. So press the [Y=] key, and then type in the variation of x squared that you want

Posted on May 11, 2009

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Fix the ERR:INVALID DIM message on my TI-84 plus, please.

INVALID DIM error message may occur if you are trying to graph a function that does not involve the stat plot features. The error can be corrected by turning off the stat plots. To turn the stat plots off, press 2nd, STAT PLOT , and
then select 4:PlotsOff.

Mar 26, 2012 | Texas Instruments TI-84 Plus Calculator

2 Answers

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

2. step: left or lower bound

3. step: right or upper bound

4.step: extreme value of the function

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

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I want to graph a parabola on my ti-84. i entered the equation in y=, and then i turned on plot on, then i hit graph, but it is showing invalid dim. help please?

You're trying to graph a function that does not involve stat plot features but the calculator probably thinks you are. You can correct this by turning off the stat plot features. Press "2ND" "STAT PLOT" and then select 4:PlotsOff.

Oct 29, 2010 | Texas Instruments TI-84 Plus Calculator

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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
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.
At this stage, use the Arrow keys to move the center of the graph to another point as in the next screen capture.

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

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.

Sep 02, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

When i put an equation in Y= the parabola appears but not the graph. why? it was just fine

The truth of the matter is that the curve drawn (the parabola) is the graph that you are seeking.
It is possible that you you mean by graph is the the set of axes. In that case you may have deactivated them. To reactivate them:
  1. Press [2nd][ZOOM] to access the (FORMAT).
  2. Press the DownArrow key 3 times to reach the line AxesON AxesOFF.
  3. Use the rightArrow to highlight AxesON and press [ENTER].
  4. Your graph will have the axes displayed.

Aug 04, 2010 | Texas Instruments TI-83 Plus Calculator

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Please help plotting graphs on TI-83 plus

I believe I already showed you with a profusion of details how to graph functions on the calculator. It would very kind of you to refer to the post that answered your question, so as not to make us answer it all over again. Much appreciated.

Read the following to use the intersection function.
  1. You draw two or more graphs.
  2. After the graphs are displayed, press [2nd][TRACE] to access the (CALC)ulate menu.
  3. Select [5:Interesct]
  4. You will be prompted for a first curve: the equation of the curve will be displayed at the top left corner of the screen. If it is one the intersecting curves, press [ENTER]
  5. You will be prompted for the second curve. (You can move from one curve to another by pressing the UpArrow or DownArrow).
  6. After two curves are selected, you will be prompted for a guess for the X-value of an intersection point: you can use the keypad to enter a guess or use the left or right arrow to move the cursor towards a point of your choosing (if there are more than one point).
  7. After a short while the calculator gives you a solution.
  8. If it fails, you must make a better guess.

Here are some screen captures





May 12, 2010 | Texas Instruments TI-83 Plus Calculator

2 Answers

TI-83 graph problems-help please. Hi, sorry to sound so stupid, but trying for hours to try to solve these using my calculator,but doing something wrong as can't get the right answers. I wonder if anyone...

Open Y= editor and type in the two functions
The calculaus functions are accessible by pressing [2nd][TRACE] to open the CALCulate menu options. For the gradient (I think you mean the derivative) use option 6:dy/dx. But first choose the point where you want it calculated (use cursor to move along the curve) and press ENTER. The value of the deivative will be calculated at the chosen point.

The vertex of the parabolas are maxima. Thus you must use option 4:maximum
You will be prompted for a left bound. Move cursor to the left of the maximum (not too far) and press [ENTER]. A fat arrow is displayed on the graph that shows the left limit of the interval. You will be prompted for a right bound. Move cursor along the curve to the right of the the vertex. Press ENTER. A seconf fat arrow will be displayed to show the right limit of the interval.

You will be prompted for a guess of the maximum. Move cursor newar the max or enter a numerical value and press ENTER.


The location of the vertex is displayed (X and Y values)
I have no idea what you mean by the equation of symmetry


May 02, 2010 | Texas Instruments TI-83 Plus Calculator

2 Answers

How to graph an equation on a t1-83?

how to fix window to graph Pythagorean property

Sep 01, 2009 | Texas Instruments TI-83 Plus Calculator

1 Answer

Graphing parabola

Parabolas are forms of X^2. Go to [Y=], then put in the formula of the parabola that you want.

May 07, 2009 | Texas Instruments TI-83 Plus Calculator

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