Question about Texas Instruments TI-84 Plus Calculator

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Cube root I cannot graph the negative cube root of x. Is there any way to do this?

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X ^ ( - 1 / 3 )
You have to use parentheses around the negative 1/3.

Posted on Jun 03, 2008

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Why does the TI-nspire not give complete graphs of cube root and other franctional power functions?


I do not see why it would do that. Maybe you restricted the domain to positive values of the independent variable.
Anyway, my CX CAS has the latest OS version and it draws cube root for positive and negative values of x.
By the way the cube root is made up of one branch only, not 2 like the square root.
Here is a screen capture.

11_7_2012_1_19_42_am.png

Nov 05, 2012 | Texas Instruments Ti Nspire Cx Cas Graph...

2 Answers

I have a TI-89 Titanium. How do I graph a function containing a cubed root?


For example y=x^(1/3)-x+1. Type this function and then graphing it!
See captured images

12_7_2011_10_52_19_pm.jpg

12_7_2011_10_52_37_pm.jpg

Sep 14, 2011 | Texas Instruments TI-89 Calculator

1 Answer

Err:no sign chng


If you were trying to find the roots (zeros) of an algebraic equation with the solve( command or the interactive solver you might have supplied an interval where the function is always positive or always negative. If the expression is always of the same sign on an interval, the interval does not contain a root.
  • If you extend the interval, the procedure may not converge fast enough and the calculator may not find the solution.
  • Abetter way to do it is to sketch the graph of the function and use the graph to choose a reasonable interval that extends on both sides of the root, and a better initial guess.
If you were doing some financial calculations,
  • You attempted to calculate the I% variable when FV, N*PMT, and PV are all positive, or all negative.
  • You tried to calculate Irr( when neither CFlist, nor CFO is positive
  • You tried to calculate Irr( when neither CFlist, nor CFO is negative

Jun 19, 2010 | Texas Instruments TI-84 Plus Silver...

2 Answers

I need to know how to enter anything above cube root into my TI-83.


  1. Use the universal power key marked with [^].
  2. To avoid problems if the exponent is an expression, enclose it in parentheses.
  3. To enter any power type number^(exponent)
  4. If exponent is negative use the (-) change sign key next to the dot, below the 3 key.
  5. To calculate the roots (cubic, fourth, fifth, etc.) roots use the fact that a root of n-th order can be represented as ^(1/n)
  6. Ex: cube root of 27: 27^(1/3); square root of 64 : 64^(1/2) or 64^(0.5)

Feb 26, 2010 | Texas Instruments TI-83 Plus Calculator

1 Answer

How do I find zeros of a function on the calculator?


Hello,
Draw the graphic of the function on the calculator. Once the graph is finished, press [SHIFT][F5-G-Solve] .Press [F1:Root]. After a while calculator comes back with a root. If there are others that you see on the graph press the left/right arrow key, depending on the location of the 2nd root on the x-line with respect to the 1st one already found. In short, if you have 2 roots, one negative , the other positive, and the calculator returned the negative one, to obtain the positive one press the right arrow key.
Hope it helps.

Oct 12, 2009 | Casio FX-9750GPlus Calculator

2 Answers

How can i graph x cube-9 on my calculator


For example if you are doing the cube root of 8 (answer is 2)

Type 3
hit shift
Press x of square root key
type 8
Press ans key

Oct 05, 2009 | Texas Instruments TI-30 XIIS Calculator

1 Answer

The calculator is only graphing a half circle when it should be a full circle, specifically not in the negative y-values of the plane.


A circle is not a function and cannot be graphed in the regular y=screen. You can graph a circle in parametric mode.

To graph a circle in the regular y= screen, you have to graph it in 2 lines on the y= screen. I assume you've solved for y and gotten a square root equation. Remember a square root can be positive or negative. In line 1 of y= screen graph what you've been graphing and then graph the same equation in line 2 but with a negative in front of the equation. You'll get something that looks like an oval since the calculator screen is rectanglular. To make it look more circular (both parts aren't going to connect), press zoom and then select #5 (square).

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

1 Answer

Graph a cubed root fuction on ti-89


Hello,
Here it is
[Diamond][Y=] enter y1=(2-X)^(1/3)
[Diamond][GRAPH]

30831a2.jpg

Hope you liked the graph

Mar 17, 2009 | Texas Instruments TI-86 Calculator

3 Answers

Entering a cubed root into a ti-83 plus


You can enter any root by typing the number, then hitting MATH and 5, which brings up the root symbol with the x in front of it: x√. So the fifth-root would be 5 -> MATH -> 5 and then whatever number you want to get the fifth-root for: 5x√10 for example. As someone else had mentioned, you can also raise it to a rational power: 3^(1/3) which would be the same as the cubed root of 3, but you could also type: 3 -> MATH -> 5 -> 3 and get the same answer, but looking like this in your calculator: 3x√3. The option for 4 actually is a predefined cubed-root, and the one for option 5 there is the root symbol that can be used with any number before it to get any root you want. There are no parenthesis as you get when using the predefined square-root and cubed-root functions, though, so you may want to type them in yourself if entering a long string of operations in the calculator at one time to make sure the calculator doesn't include numbers under the root that you don't want it to. But I guess it depends on preference in terms of what method you choose between the rational exponents or the root symbol (and most would go with whichever seems easiest and quickest to enter), but you asked specifically how to get the cubed-root on the TI-83 Plus, so there's my best attempt at answering your question.

Aug 22, 2008 | Texas Instruments TI-83 Plus Calculator

3 Answers

Graphing radical functions


I have a TI-89 Titanium and I have experienced the same problem. HERE IS HOW TO FIX IT:

Goto " MODE " and scroll down the options until you get to
" COMPLEX FORMAT " change that option to " RECTANGULAR " and press ENTER until you exit out of the " MODE " screen. (very important that you press ' enter ' until you exit because if you don't, it will not save your changes. )

Sep 19, 2007 | Texas Instruments TI-89 Calculator

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