On the TI 83 plus the solver function was working fine up until recently. Now I put in the problems and get the error "No sign change" and underneath the answer and boundaries it now says "left-rt=(a different number each time I put in a new equation). I tried resetting my calculator and it didn't fix it.

Clearing the memory usually fixes this problem for me. If you hit 2nd and then + it will take you to the memory menu, where you can clear it by hitting 7. I usually hit clear all memory and confirm, and that fixes the problem for an equation or two, three if I'm lucky. For some reason using the solver too much makes it increasingly inaccurate to the point where you can't get an answer at all, but I don't know why.

Posted on Feb 05, 2013

Try a simple equation like x^2-1 which should come out with x = 1,-1

no sign change would indicate that the graph of the curve never crosses the x axis, if you graphed the above equation and calculated the zeros, it would come out with -1, 1 which it should, but if you put in x^2+1, the graph would never cross and therefore have no sign change from pos to neg or vice versa, the left-rt are the left and right bounds or the lower and upper bounds which was corrected in later calculators, Please let me know the outcome of graphing both of the above equations and then putting them in the solver. you could also use the quadratic equation to prove the answers if you liked, hope this helps

Posted on Mar 23, 2008

Most probable that you are not using the correct syntax.

Press MATH, then scroll down to reach the SOLVER line. Press ENTER. Create the equation, using the ALPHA keyboard to type in letter symbols.

Press ENTER. The screen that opens displays the equation and a list of the variable present in your equation. Each letter (variable) must have a value, except the unknown. If there is a 0 after the = sign on the same line as the unknown, you must clear it so as to leave a blank.

Specify the lower bound and the upper bound to speed up the search.

Once finished press [ALPHA][ENTER] to execute the (SOLVER)

Press MATH, then scroll down to reach the SOLVER line. Press ENTER. Create the equation, using the ALPHA keyboard to type in letter symbols.

Press ENTER. The screen that opens displays the equation and a list of the variable present in your equation. Each letter (variable) must have a value, except the unknown. If there is a 0 after the = sign on the same line as the unknown, you must clear it so as to leave a blank.

Specify the lower bound and the upper bound to speed up the search.

Once finished press [ALPHA][ENTER] to execute the (SOLVER)

Oct 20, 2011 | Texas Instruments TI-83 Plus Calculator

You can't simply enter 7x+9=30 into the calculator, there is a way to calculate what the x is but its been a few years since I've done these..

Oct 03, 2008 | Texas Instruments TI-83 Plus Calculator

The error data type means that the program is expecting a specific type of data ( number, list, matrix, real, complex, string, etc.) while you are feeding it some other type of data. The point in the program where you are taken when the error occurs is where the exception was launched.

A common source of error stems from the use of variables that are global and defined in some other program. You can use the same name inside your program as long as you declare the variable local.

If your program is in fact a function, then all its argument must be passed in the call to the function: You cannot ask a function to read your input.

I will not pretend to know why you get the error, but the few comments I made above may help you debug the program.

By the way, if you are interested a Cobebrook online calculator, here is a link

A common source of error stems from the use of variables that are global and defined in some other program. You can use the same name inside your program as long as you declare the variable local.

If your program is in fact a function, then all its argument must be passed in the call to the function: You cannot ask a function to read your input.

I will not pretend to know why you get the error, but the few comments I made above may help you debug the program.

By the way, if you are interested a Cobebrook online calculator, here is a link

Apr 26, 2011 | Texas Instruments TI-89 Calculator

One way is to use the Polynomial Root Finder and Simultaneous Equation Solver app.

Press the APPS key, then select PlySmlt2 and press ENTER. Press ENTER to get past the opening screen, then select "POLY ROOT FINDER" and press ENTER. Select the order of the polynomial and other settings as desired. Press F5 (the GRAPH key) to go to the next screen. Enter the polynomial coefficients, then press F5 to solve. The next screen will show you the roots (unless you selected real roots and the polynomial doesn't have any real roots).

If you don't have the app installed, you can download it from

http://education.ti.com/educationportal/sites/US/productDetail/us_poly_83_84.html

Press the APPS key, then select PlySmlt2 and press ENTER. Press ENTER to get past the opening screen, then select "POLY ROOT FINDER" and press ENTER. Select the order of the polynomial and other settings as desired. Press F5 (the GRAPH key) to go to the next screen. Enter the polynomial coefficients, then press F5 to solve. The next screen will show you the roots (unless you selected real roots and the polynomial doesn't have any real roots).

If you don't have the app installed, you can download it from

http://education.ti.com/educationportal/sites/US/productDetail/us_poly_83_84.html

Jan 20, 2011 | Texas Instruments TI-83 Plus Calculator

Press the APPS key to bring up the Applications menu. Press 1 to select "Finance..." Press 1 to select "TVM Solver..."

Jun 14, 2010 | Texas Instruments TI-83 Plus Calculator

Some variable in your function is in archive memory. Press 2ND [MEM] 2 to get into the Memory Management menu. Press 1 to select All. Do you see a variable you're using in your function with an asterisk to its left? If so, navigate down to it and press ENTER to turn off the asterisk. Do this for as many variables as necessary, then press 2ND [QUIT] to exit.

Try the Solver again.

Try the Solver again.

Apr 08, 2010 | Texas Instruments TI-84 Plus Calculator

Hi,

Through the Finance Application. Press [APPS][1:Finance][1:TVM-Solver] [ENTER].

Hope you find it.

Through the Finance Application. Press [APPS][1:Finance][1:TVM-Solver] [ENTER].

Hope you find it.

Dec 03, 2009 | Texas Instruments TI-83 Plus Calculator

I'm not sure what calculator you wanted on:Ti 89

The Ti 84/83 you would use the solver in the math key. just have it =0

The Ti 84/83 you would use the solver in the math key. just have it =0

Sep 24, 2009 | Texas Instruments Calculators

Click APPS and then ENTER for Finance and then ENTER again for the TVM Solver. There you can input the PV, PMT, i, etc.

Jun 22, 2009 | Texas Instruments TI-83 Plus Calculator

Use the (-) key next to the decimal point to enter the negative value, not the - key.

Jan 28, 2009 | Texas Instruments TI-83 Plus Calculator

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