Question about Texas Instruments TI-89 Calculator

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Inequality My TI89 does not solve the inequality (3x + 1)/x < 0. However several students of mine can. How is this possible?

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inequality - inequality-juyoa5w5rh0i5nfljg0adg2b-4-0.jpg

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You need to input the equation, (3x+1)/x<0, then you need to indicate that you are solving for x by putting comma then x. The equation you are inputting should look like this: solve((3x+1)/x<0,x) and the answer will be -1/3<x<0. That ",x" is telling the calculator to solve for x.

Posted on Oct 17, 2008

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Mrs. Jones lets her students wear fuzzy slippers to school if they earn 30 stickers. She gives them 4 stickers for every week that they have perfect attendance. Kelsie already has 8 stickers. Which i


Let x be the number of future weeks.

8 + 4x >= 30

Solve for x by subtracting 8 from each side and dividing by coefficient in front of variable. Plug answer into original equation to check that it works correctly.

Good luck,

Paul

Jan 28, 2014 | Casio FX-115ES Scientific Calculator

1 Answer

How to solve x3-3x2-4x through this fx-82MS calculator?? pls rply as soon as possible..


There is nothing to solve because you do not have an equation, nor an inequation (inequality). You need an equal sign, >,<, etc.
All you can do with this polynomial is try to factor it. Here is the factored out form
x^3-3x^2-4x=x(x^2-3x-4)=x(x-4)(x+1)
To factor (x^2-3x-4) look for the divisors of -4 whose sum is -3
You cannot do that on your calculator because is does not have a Computer Algebra System or CAS.

Oct 02, 2013 | Casio FX82MS Scientific Calculator

2 Answers

Where is the less than sign on my calculator


The relational operators (=, >, <, and similar symbols) are available in two places.
If you are trying to draw an inequality graph
Press the Graph Menu,
Press F3:Type
Press F6:> to access other tabs. The 4 inequality symbols are availabe in the following screen.
Press F1:>, F2:< etc. to type in the inequality sign in your inequality.

If you want the relational operators for some other purpose, you can access then in the catalog of commands.
Press Menu
Press 1:Run>Mat to go to the main calculator screen
Press [SHIFT][4] (Catalog] to open the Catalog.
Scroll up or down until you reach the relational operator you want.
Select it and press EXE.

Jul 04, 2012 | Casio FX9750GII Graphic Calculator

2 Answers

Where is the less than sign?


The relational operators (=, >, <, and similar symbols) are available in two places.
If you are trying to draw an inequality graph
Press the Graph Menu,
Press F3:Type
Press F6:> to access other tabs. The 4 inequality symbols are availabe in the following screen.
Press F1:>, F2:< etc. to type in the inequality sign in your inequality.

If you want the relational operators for some other purpose, you can access then in the catalog of commands.
Press Menu
Press 1:Run>Mat to go to the main calculator screen
Press [SHIFT][4] (Catalog] to open the Catalog.
Scroll up or down until you reach the relational operator you want.
Select it and press EXE.

Jul 04, 2012 | Casio FX9750GII Graphic Calculator

2 Answers

How do you solve for an inequality with an absolute value using functions on calculator? (example |x-1|<9


Sorry, the calculator cannot solve such ualities (nothing to do with the absolute function).
To find the solution set you need to study the two cases for the absolute value.
Case 1
If x-1> 0, the absolute value is x-1. The inequality takes the form x-1<9. You can solve it as x<10

Case 2
If x-1<0, then the absolute value is 1-x. The inequality becomes 1-x<9. The solution for this inequality is x>-8

Combine the two domains to find the intersection
-8<x<10


2_7_2012_12_43_39_am.png

Sep 13, 2011 | Casio FX9750GII Graphic Calculator

2 Answers

If there are 623 students and the ratio of girls is 2 to 3 boys. how many girls are there?


The best way to solve this is to develop one or more equations and then solve for the unknown numbers.

I solved this problem twice using different sets of equations to make sure I was right, and here is what I found:

1) I used the equations x + y = 623, and x = (2/3)y. In these equations, x is the number of girls and y is the number of boys.
Substituting the second equation into the first, I get (2/3)y + y = 623.
Adding the left side together I get : (5/3)y = 623.
Dividing both sides by (5/3) I get 373.8.
This means that x (the number of girls) is 249.2.

2) For the second attempt, I developed the equation: 2x+3x=623. Here 2x is the number of girls, and 3x is the number of boys.
Adding the left side I get: 5x = 623.
Dividing both sides by 5 I get: x = 124.6.
This means that the number of girls (2x) is 249.2. Just like in the first method.

But since you can't have a 1/5 of a girl, the answer must be 249 girls.

Nov 19, 2009 | Calculators

1 Answer

Using the ti89 to solve mesh equations


This book is what I used to help learn how to solve mesh circuits. A high education level helps. You just set it up as you see it in a simultaneous equation.

Electrical Engineering Applications with the TI-89
Electrical Engineering students will find the 70 topics covered in this book provide in-depth analyses of how to solve many common engineering problems using the powerful CAS system of the TI-89.
Author(s) - David R. Voltmer and Mark A. Yoder
raklein62@yahoo.com

Mar 23, 2009 | Texas Instruments TI-89 Calculator

2 Answers

How to use ti 89 with a problem like "-(3x+1)-(4x-7)=4-(3x+2)'


Just plug in one side of the equation and find the answer. Then plug in the other side and compare answers.

Feb 19, 2008 | Texas Instruments TI-89 Calculator

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