Question about Texas Instruments TI-89 Calculator

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Posted on Sep 18, 2016

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

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

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

All you can do with this polynomial is

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

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.

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.

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

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.

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.

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

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**

To find the solution set you need to study the two cases for the absolute value.

If x-1> 0, the absolute value is x-1. The inequality takes the form x-1<9. You can solve it as

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

Sep 13, 2011 | Casio FX9750GII Graphic Calculator

these calculators have a small ram memory battery inside open the case remove it then put it back in "think watch battery" this happened to mine.

Jul 17, 2010 | Texas Instruments TI-89 Calculator

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.

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

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

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

See captured image below

May 21, 2008 | Texas Instruments TI-89 Calculator

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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