Question about Texas Instruments TI-83 Plus Calculator

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Calculate Menu Problems

When I graph a function and then try to find it's dy/dx, via the [2nd] [calc] menu, my calculator displays the dy/dx value at the bottom of the (graph)screen as it should. But only for a fraction of a second. The value is almost immediately covered up becuase the calculator displays the x and y values of the cursor's coodinates in the place where the dy/dx value was just displayed.

I've noticed that the x,y values at the bottom of the screen are "refreshed" or are "blinking" or something, every time the cursor blinks.

I've tried seeing if turning off the option to display coordinates on the graph would help ( [2nd] [FORMAT] CoordOn --> CoordOff). But the problem remains exactly as described above.

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If you have more than one function graphed, use Up/Down to select the one you want. Press Left/Right to select the point at which you want the derivative, then press ENTER to see the value of dy/dx.

Posted on Feb 19, 2010

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Derivatives


Tell me where the key (or Submenu TAB) is and I will tell you how to use it. Apparently you were living in TI Planet and now have moved to Casio Planet and you need to adjust to the jet lag brought about by the transition.

In Run>Mat press [SHIFT][ MODE] to enter the (Setup).. On the 5th line: Derivative set the selection to ON.
Press Menu then Graph. Enter a function, validate and press F6:Draw.
Once graph is draw press the F1:trace key. A CROSS appears on the graph indicating the default starting position. At the bottom of the screen you see X=, Y=, and dY/dX=
The last one is obviously the value of the derivative at the position of the cross. Move the cursor to another point to see the values X, Y, and dY/dX.
You can also enter a value of X to find Y and dY/dX. Make sure the X-value you enter is in the interval between Xmin and Xmax, the window limits.

Nov 04, 2013 | Casio FX9750GII Graphic 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
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...

1 Answer

Find derivatives


The TI-84 does not have a Computer Algebra System and therefore cannot perform this operation.

It can however find the value of a derivative at a single point on a function. Put the function into your Y= menu and graph it. Press 2nd and Trace to go to the calc menu and choose the "dy/dx" option. Type the x-value at which you want to evaluate the derivative and press enter.

Dec 15, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

How do we find the coordinates of a maximum,minimum or point of inflexion on the calculator?is it possible to find the differentiation of an equation with the calculator?thanks


Once the graph is drawn you can use the Calculate menu to find
  • 1:value, the value of the function at a point
  • 2:Zero, the coordinate of a point where the function vanishes (has value zero)
  • 3:minimum, the location of a point where the function has a minimum
  • 4:maximum
  • 5:intersect , the value of the function when it crosses the y-axis (y-intercept)
  • 6:dy/dx, the value of the derivative of the function at a point.
  • 7: Integral (f(x),dx)
For most of the foregoing calculations, you need to supply the interval of x-values that is of interest to you.To move the cursor along the curve to set the left limit and right limit of the interval of interest, use the LeftArrow and RightArrow keys.

You cannot find the location of an inflexion point as this requires the knowledge of the 2nd derivative of the function, and this calculator calculates the first derivative only. However, there may be 3rd-party programs that handle this, on ticalc.org website. Use at your own risk and under your sole responsibility.

To access the seven menu options above, you press [2nd][TRACE] to open the (CALC) menu. Use the Down and Up Arrows to move cursor along the menu options.

Oct 28, 2010 | Texas Instruments TI-84 Plus Calculator

1 Answer

How to use graphing calculator?


The casio FX-300Ms calculator cannot do graphs. To tell you how to use a graphing calculator TO DRAW GRAPHS we need to know the exact brand and model number of the calculator.

  1. Most graphing calculators basically function the same way.
  2. You select the graph type (function, polar,parametric, sequence, 3D, wire mesh, slope field, etc.)
  3. You enter the algebraic form of the function you want to draw.
  4. You press a button or menu to GRAPH
  5. The graph is drawn.
  6. If you want to see a particular part of the graph, you use a ZOOM function, or you enter values for the WINDOW dimensions.
  7. Most graphing calculators have a TRACE function that allow you to follow the curve you have drawn to read off values of coordinate points.
  8. You can also use the calculator to find zeros roots) of functions, calculate derivatives at some chosen points or calculate the area "under the curve", find the minimum and maximum of a function.
In addition to its graphing capabilities, a graphing calculator can be used as a scientific calculator. Sometimes it can also do statistical and financial calculations, matrices, list manipulations, operations on complex numbers, text editing,, creating programs etc.



Aug 13, 2010 | Casio FX-300MS 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...


Parabolas
Open Y= editor and type in the two functions
6447ca5.jpgbbeaa23.jpg
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.
50e3257.jpg005508b.jpg

The vertex of the parabolas are maxima. Thus you must use option 4:maximum
24d4168.jpgb57bf8d.jpg
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.

3b702ee.jpg22c11ef.jpg

The location of the vertex is displayed (X and Y values)
3908f7c.jpg
I have no idea what you mean by the equation of symmetry

Intercept.

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

1 Answer

How to find area between 2 curves


Hi,
The TI84Plus has a Shade( function which allows you to represent the area you want to calculate.
The simplest syntax of the command is

Shade( lower_function, upper_function, Xleft, Xright, pattern, patern_resol) where Xleft is the left limit, Xright is the right limit, pattern is the shading pattern and pattern_resol is the resolution of the shading. Only the area where lower_function is less than upper_function is shaded. Unfortunately this command does give the value of the shaded area.

To find the area between two curves
  1. Draw the curves
  2. Find the left intersection point using [2nd][CALC][5:intersect]. Sorry I will not describe the procedure. The X value of the intersection point is stored in Ans memory.
  3. Press [2nd][QUIT] to go to main calculator screen.
  4. Store the Ans result in say A: [2nd][Ans][STO->][ALPHA] A
  5. Return to the graph by pressing [GRAPH].
  6. Find a second intersection point. Result is stored in Ans memory.
  7. Press [2nd][Quit] to return to main calculator screen
  8. Press [2nd][Ans][STO->][ALPHA] B to store the X value of the second intersection point in B.
  9. Use the CATALOG to paste the fnInt( command to calculate the integral : [2nd][CATALOG][[APLHA] F and scroll to select fnInt( and press [ENTER]
  10. To complete the command you need the identifiers Y1 and Y2.. You access the identifiers Y1 and Y2 by pressing [VARS][Y-VARS][1:Function][1:Y1] and [VARS][Y-VARS][1:Function][2:Y2]
  11. The command should appear as fnInt( Y2-Y1,A,B)
  12. Press [ENTER] to obtain your value.
Hope it helps.
Thank you for using FixYa.
Do not forget to rate the solution.



Dec 03, 2009 | Texas Instruments TI-83 Plus Calculator

1 Answer

Can the TI 84 calculate second derivatives?


Hello,
I am sorry to disappoint you, the nDeriv ( function can only calculate numerical derivatives of an expression at a point. The dy/dx can do the same thing (calculate the first derivative) at one point on a displayed graph. It can be activated for graphs by pressing TRACE, then [2nd][CALC][6:dy/dx]. If you need the derivative at more than one point you have to press [2nd][CAL] [6:dy/dx] again.

What I said above concerns the native abilities of the calculator. There may be applications you can install to allow computation of 2nd derivatives. look for them on the TI site, or the archive section of ticalc.org. Try deriv

Hope it helps.

Nov 05, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

My TI 84 Plus Caluclator


Hello,
The function Intersect from the CALCULATE menu finf the coordinates of a point at which two or more curves intersect.
To use it:
1. Draw the functions.
7036100.jpg
2. Press [2nd][CALC][5:Intersect]

4c21f92.jpg

The cursor is on one of the curves. Read the equation top of the screen. If it is one of the curves you want press [ENTER]. The cursor jumps to another curve (in this case the only other curve).
f75e725.jpg
Read the equation on top of the screen to verify thst it is the correct one. Press [ENTER]. The calculator asks asks for a guess of the coordinates of the intersection point.
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As the intersection point is to the left of the current cursor position, use the left arrow to move cursor closer to the point.

d22f78b.jpg
Press [ENTER], and wait for the solution. Here it is.
2b043d0.jpg

In your question you talk about y intercept. If you want to calculate the ordinate of the point where a curve intersects the Y-axis, it is more efficient to use the [2nd][CAL][1:Value] selection.
0a11a73.jpg
You enter X=0 and press [ENTER]. The cursor jumps on the first curve (Y1=) an gives you the y-intercept.
7420d8f.jpg
Notice the position of cursor on graph. The y-value at the bottom is its ordinate.
To get the y-intercept of the second curve, leave the cursor on y axis and press the DownArrow. Cursor jumps to tthe second curve.
Since the X=0 is still stored, the value of y is displayed directly.

b14da69.jpg

Hope it helps.

Oct 27, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

How do you do arcsin on the TI-34II?


  1. Pressing [2nd] and [TRIG] displays a menu of all available trigonometric functions.
  2. The arcsine is represented as menu item [SIN^-1].
  3. Select the function from the menu, enter the value and press [=].
  4. A word of caution:
  • Before you calculate any inverse trigonometric function value, make sure the angle unit is correct. (Degree or radian).

Oct 06, 2009 | Texas Instruments TI-34II Explorer Plus...

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