Question about Texas Instruments TI-89 Calculator

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When I try to factor a problem it gives me an answer with periods. example: I enter FACTOR(x^3-5xx) and the answer comes up as (2.)^2(3.)

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You apparently have a numerical value stored in the variable "x" and the calculator is using that value. To get rid of it, press 2ND [VAR-LINK], scroll down to the line containing the variable x, press F1 1.

Posted on Jul 06, 2010

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1 Answer

What is factoring and give the examples


Quick-Start Guide When you enter an expression into the calculator, the calculator will simplify the expression by expanding multiplication and combining like terms. At this point the calculator will attempt to factor the expression by dividing a G C F, and identifying a difference between two squares, or factorable trinomials. Use the following rules to enter expressions into the calculator. Variables Any lowercase letter may be used as a variable. Exponents Exponents are supported on variables using the ^ (caret) symbol. For example, to express x 2, enter x ^ 2. Note: exponents must be positive integers, no negatives, decimals, or variables. Exponents may not currently be placed on numbers, brackets, or parentheses. Parentheses and Brackets Parentheses ( ) and brackets [ ] may be used to group terms as in a standard expression. Multiplication, Addition, and Subtraction For addition and subtraction, use the standard + and - symbols respectively. For multiplication, use the * symbol. A * symbol is optional when multiplying a number by a variable. For instance: 2 * x can also be entered as 2x. Similarly, 2 * ( x + 5 ) can also be entered as 2 ( x + 5 ) ; 2 x * ( 5 ) can be entered as 2 x ( 5 ). The * is also optional when multiplying parentheses, example: ( x + 1 ) ( x - 1 ). Order of Operations The calculator follows the standard order of operations taught by most algebra books - Parentheses, Exponents, Multiplication and Division, Addition and Subtraction. The only exception is that division is not currently supported; attempts to use the / symbol will result in an error. Division, Square Root, Radi cals, Fractions Division, square root, radi cals, and fractions are not supported at this time. A future release will add this functionality.

that's all I can say basically I learned it this way.

Jul 09, 2015 | Office Equipment & Supplies

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

1 Answer

Cant find the constant key to multiply


1. Enter the constant factor (example: 20).
2. Strike the Multiply key twice.
3. Enter the nonconstant factor (example: 14).
4. Strike the Equals key to obtain the product (280).
5. Enter the next nonconstant factor (example: 7).
6. Strike the Equals key to obtain the next product (140).
7. Keep entering the next factor you wish to multiply by the constant and just hitting the enter key.

Dec 06, 2011 | Casio HR-100TMPlus Calculator

1 Answer

What is prime factorization?


"Prime Factorization" is finding which prime numbers multiply together to make the original number.


Example : What are the prime factors of 12 ? It is best to start working from the smallest prime number, which is 2, so let's check:

12 ÷ 2 = 6
Yes, it divided evenly by 2. We have taken the first step!
But 6 is not a prime number, so we need to go further. Let's try 2 again:

6 ÷ 2 = 3
Yes, that worked also. And 3 is a prime number, so we have the answer:

12 = 2 × 2 × 3

As you can see, every factor is a prime number, so the answer must be right.

Note: 12 = 2 × 2 × 3 can also be written using exponents as 12 = 22 × 3

Jun 22, 2011 | Computers & Internet

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

Im am baffled. my ba-II plus is not calculating TVM correctly. ive tried resetting, making sure end period was selected (i.e. ordinary annuity) but no luck. as an example i enter... n=1, i=10, pv=-1,...


It's giving you the correct answer for the problem you've input. When you specified 1 for n, you told it one month. If you specify more digits, you'll see that the answer is 1.00833333.

By default, the calculator works with annual interest rates but counts periods in months.

Jun 11, 2010 | Texas Instruments BA-II Plus Calculator

1 Answer

Does a TI 89 have an advantage over a TI 84 in a 10th grade algebra class? My sons teacher won't let him use an 89. He says it does too much of the work for him. Is this right?


the 89 is in my opinion not need/ approriate for a 10th grade algebra class, or worth the extra money.

for example the 84 wont output variables it must output a number

so your son may be doing factoring, if he inserts (x^2+2x+1) the 89 will allow him to enter it and factor it as (x+1)(x+1) or (x+1)^2 the 84 will not.

the 84 will do pleanty as far as graphing, finding zeros,plotting, calculations, and should get him any answer that he seeks so long that he knows how to use the 84. It just wont give him the intermediate steps the the 89 is able to give.

hope this helps

Apr 05, 2010 | Texas Instruments TI-84 Plus Calculator

3 Answers

Inputing factors on a casio fx-115es calculator


Unless I am failing to understand your problem, just combine like terms to get:
9x^2+2x+4 and then enter those coefficients into the quadratic solver.
That will get you the two answers -- both of them will be complex.
If you wanted to turn those two answers into factors (complex) of the original equation simply
change the signs on each and put an x in front.
Of course, the quadratic formula would also work.
CG

Apr 17, 2009 | Casio FX-115ES Scientific Calculator

5 Answers

Ti89 titanium


WHAT IS THE KEY OR KEYS TO GET THE INVERSE LOG FUNCTION?

Apr 02, 2008 | Texas Instruments TI-89 Calculator

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