Question about Texas Instruments TI-89 Calculator

When i use "solve(" for equations with absolute values or inequalities, the calculator only simplifies what i put in; it does not solve for x.

for example,

I put in: solve (abs (2x - 3) - 4 < 7, x)

and it gave me: abs (x - 1.5) < 5.5

n.b. these operations USED to work on my calculator until i attempted to connect it to my computer (after i used the TI connect, all the settings and operations on my calculator got messed up)

See captured image below

Posted on Feb 09, 2016

3/4 y 5=3/5y-1

Posted on Sep 06, 2010

Just reset everything

Posted on Jun 04, 2008

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Posted on Jan 02, 2017

You must consider two cases.

**1st case:** What is inside the absolute value symbols is supposed **positive**. Remove the absolute value symbols and proceed to solve.

**2nd case:** What is inside the absolute value symbols is supposed **negative**. Enclose the contents of the absolute value within parentheses, put a negative sign in front the left parenthesis, and proceed to solve.

Gather the solutions obtained in the two cases. Use a Union symbol for the solution set.

Gather the solutions obtained in the two cases. Use a Union symbol for the solution set.

Oct 08, 2014 | Office Equipment & Supplies

Is it complex or matrix? You can have only one mode at a time.What kind of equations? The solve function uses real-valued equations.

Complex numbers: You can add, subtract, multiply and divide. You can convert a number from rectangular to polar forms and vice-versa; you can calculate the absolute value of a complex number, or a conjugate.

All the operations are done in the Mode CMPLX.

Complex numbers: You can add, subtract, multiply and divide. You can convert a number from rectangular to polar forms and vice-versa; you can calculate the absolute value of a complex number, or a conjugate.

All the operations are done in the Mode CMPLX.

Feb 04, 2014 | Casio FX991MS Scientific 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

If you want to graph the absolute value of a function, feed the function to the absolute value ie graph y= abs(f(x)). The calculator will take care of it. See screen captures where I draw the function y1=x^3-5x^2-3 and y2='x^3-5x^2-3'. On the first graph the function is represented and on the second the function and its absolute value.

The calculator knows how to calculate the absolute value of an expression. The name of the command is abs(

The calculator knows how to calculate the absolute value of an expression. The name of the command is abs(

May 08, 2011 | Texas Instruments TI-89 Calculator

This expression 5x^2+15x+3 is not an equation, therefore it can have any value depending on the value of x. You have to make it an equation before looking for the particular value of x that satisfy your equation **5x^2+15x+3 =0**

This calculator cannot solve equations because it does not have an equation solver.

This calculator cannot solve equations because it does not have an equation solver.

Dec 15, 2010 | Sharp ELW535 Calculator

I assume that if you want to input the equation it is with the intent to solve it. If that be the case then what follows will help you input and solve any equation (linear, quadratic, trig, etc.)

Make sure the calculator angle unit is the same as your problem requires (degree, radian, grad). Here are some screen capture to help you. Change the equation to yours.

To enter the equation in screen above, use the right arrow.

You have to enter an initial guess on line X=, a default value may be supplied by calculator: It depends on last value stored in X. Once a value is entered press the F6 key to SOLV

Press F1: Rept if you want to solve another equation.

Make sure the calculator angle unit is the same as your problem requires (degree, radian, grad). Here are some screen capture to help you. Change the equation to yours.

To enter the equation in screen above, use the right arrow.

You have to enter an initial guess on line X=, a default value may be supplied by calculator: It depends on last value stored in X. Once a value is entered press the F6 key to SOLV

Press F1: Rept if you want to solve another equation.

Nov 13, 2010 | Casio FX-9860G Graphic Calculator

You can use symbols (X,Y,A,B,C,D, and M, =) to create expressions to use
in the SOLV program or to generate a table of values.

To type them you use [ALPHA] followed by the symbol you want. The symbols on the body of the calculator are of the same color as the ALPHA key. The [=] in expressions is different from the general = sign at the bottom of the keypad.

There are also some typical equations already in the calculator: simultaneous linear equation in 2 or 3 unknowns, and polynomial equations of 2nd and 3rd degree. They are accessed under the EQUATion Mode.

To type them you use [ALPHA] followed by the symbol you want. The symbols on the body of the calculator are of the same color as the ALPHA key. The [=] in expressions is different from the general = sign at the bottom of the keypad.

There are also some typical equations already in the calculator: simultaneous linear equation in 2 or 3 unknowns, and polynomial equations of 2nd and 3rd degree. They are accessed under the EQUATion Mode.

Jun 21, 2010 | Casio FX-115ES Scientific Calculator

You can use symbols (X,Y,A,B,C,D, and M, =) to create expressions to use in the SOLV program or to generate a table of values.

To type them you use [ALPHA] followed by the symbol you want. The symbols on the body of the calculator are of the same color as the ALPHA key. The [=] in expressions is different from the general = sign at the bottom of the keypad.

To type them you use [ALPHA] followed by the symbol you want. The symbols on the body of the calculator are of the same color as the ALPHA key. The [=] in expressions is different from the general = sign at the bottom of the keypad.

Jun 20, 2010 | Casio FX-115ES Scientific Calculator

Hi,

First let us repair the terminology.

Hope it helps.

Thank you for using FixYa and for rating this solution.

First let us repair the terminology.

- You can evaluate any expression (find the value of any expression for a particular value of its variable).Store a value in the variable, say X. Key in the expression and press [EXE].
- You can consider your expression(should not contain a relational operator such as =, greater than, less than, greater than or equal to, less than or equal to) to be a function Y1(x) = expression and graph it, or generate a table for it. You will have several values of the function calculated at various points.
- You can set your expression equal to 0 and find the particular value(s) of the variable (the unknown) that make the equality TRUE. That is called solving an equation.

Hope it helps.

Thank you for using FixYa and for rating this solution.

Nov 05, 2009 | Casio FX-7400G Plus Calculator

May 21, 2014 | Texas Instruments TI-89 Calculator

Feb 17, 2014 | Texas Instruments TI-89 Calculator

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