Question about Texas Instruments TI-89 Calculator

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Factoring and expanding

When i try to factor or expand any equation, all i get as an answer is { }. is there something in the mode menu that i have to change?

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  • saxofoonie Jul 25, 2008

    it says "non algebraic variablein expression" when i factor

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  • 16 Answers

Try going to var link and deleting any variables like x and whatever you're trying to factor as they may be stored as lists and thus come out factored like that

Posted on Jul 10, 2008

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1 Answer

My ti 89 won't factor


The polynomial cannot be factored in the set of Real numbers: The roots of the polynomial equation are complex.
You should use the command cFactor( found under F2:Algebra> A:Complex>2:cFactor(
However, you should set the Mode Complex>Rectangular, and the EXACT/APPROXIMATE mode to Exact, otherwise your roots will be in decimal representation.
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Jan 01, 2014 | Texas Instruments TI-89 Calculator

2 Answers

How do i solve the equations (r-3)(r+6)=0 using my ti-30xa


If you expand that formula into r^2 +3r - 18 = 0, then you can use the quadratic formula.

The two solutions for r are:

r = (-3 + sqrt((-3)^2 -4(1)(-18))) / 2(1) = 3

and

r = (-3 - sqrt((-3)^2 -4(1)(-18))) / 2(1) = -6

Try typing those in using the calculator to get the same results.

May 25, 2011 | Texas Instruments TI-30XA Calculator

1 Answer

When typing in the following I go not get the right answer on nspire cas expand((3m^3n^2)(2mn)) give me 6m^3n^2 mn instead of 6m^4n^3 why?


Simple. The calculator interpreted what you entered as much as it could. However when it got to the 2mn part, it recognized the factor 2 and carried out the multiplication of 3 and 2 to give 6, but you never defined for it what mn was. To make sure it understands, insert an explicit multiplication sign between m and n, otherwise it considers the grouping as some new variable. Implicit multiplication cases are easily recognized when they involve a number and a variable, but not when two letters follow one another.

Note: I believe you are not using the right command. Yes, it gives the result here, but the command you should be using is factor( rather than expand(. expand( will open up parentheses and lengthen the expressions. Just thought you might want to know.

Feb 21, 2011 | Texas Instruments TI-Nspire Graphic...

1 Answer

Calculator is not expanding or factorising algebraic expressions as should. Gives answers in curly brackets which seem unrelated.


I am somewhat puzzled at your affirmation concerning factoring and expanding algebraic expressions. The TINspire does not do symbolic algebra, only the TI Nspire CAS does.
If you have the TINspire CAS, (version 2.x) you can
  1. press the HOME button, then select A:Calculate.
  2. In one of the pages, press MENU.
  3. Select [3:Algebra]
  4. Use Down Arrow or enter the number 2:Factor, or 3:expand
  5. In the command line, expand( , complete the command by entering the expression, close the right parenthesis and press [ENTER].
  6. The calculator should give you the expanded result.

Feb 08, 2011 | Texas Instruments TI-Nspire Graphic...

1 Answer

When i try expand solve or factor i get a dimension error


Using solve and factor requires correct mode and proper equation set up. Ref to manual might help.

Jul 20, 2009 | Texas Instruments TI-89 Calculator

1 Answer

How to factor with this model


Hello,
Sorry, but you cannot use this calculator to factor a general polynomial.
1. It does not know symbolic algebra.
2. It can only manipulate numbers.

However if you have polynomials of degree 2 or 3, with numerical coefficients (no letters) you can set [MODE] to Equation and use the equation solver to find the real roots of 2nd degree or 3rd degree polynomials. Assuming that your polynomials have real roots (X1, X2) for the polynomial of degree 2, or (X1, X2, X3) for the polynomial of degree 3, then it is possible to write

P2(X) =a*(X-X1)(X-X2)
P3(X)= a(X-X1)(X-X2)(X-X3)


where a is the coefficient of the highest degree monomial aX^2 +...
or aX^3 +....

This is an approximate factorization, except if your calculator configured in MathIO, has been able to find exact roots (fractions and radicals)

While the [MODE][5:Equation] only handles quadratic and cubic equations, the [SHIFT][SOLVE=] solver finds the roots of arbitarry expressions (not limited to polynomials). In principle you can use it to find the roots of an expression. If it is a polynomial of dgree higher that 3 you can factor it (approximately).

But I have a hunch that this is not what you wanted to hear.

Hope it helps.

Dec 09, 2008 | Casio fx-300ES Calculator

5 Answers

Factoring


x^2+5x+7 won't factor any more.. if you're trying to solve it, do:

solve(x^2+5x+7=0,x)

May 15, 2008 | Texas Instruments TI-89 Calculator

1 Answer

When factoring or finding deriv. it gives me number?


oh yeah, you must've archived x, that is, you put a number onto the x variable so that the calculator calculates the answer for you, and THEN AUTOMATICALLY calculates the answer when x is in terms of that number. I am guessing you accidentally did 10[sto] x at one point. You can simply unarchived the x number and everything will be dandy!

Dec 08, 2007 | Texas Instruments TI-89 Calculator

1 Answer

TI-89 Factoring Not Working


I think what you want to do is not to factor but to expand, which is the option right under factor [F2, 3]. expand((x-5)^2) = x^2-10x+25

Jul 13, 2007 | Texas Instruments TI-89 Calculator

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