Question about Texas Instruments TI-84 Plus Calculator

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My solver is giving me the wrong answers - Texas Instruments TI-84 Plus Calculator

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Hi,
I have no way of knowing why it is giving you wrong answers. If you have an idea what the answer might be, you should use this knowledge to help the calculator find your solution, either by giving a better guess (initial value) or by restricting the domain of values, instead of -1e99 and 1E99.

It is also possible that you may have set up the problem incorrectly. For this reason I am describing how to use the Solver and the solve( command.

You have two ways to solve an equation with the TI84Plus

  1. The solve( command the syntax of which is solve( expr, var,guess, {lower_limit, upper_limit}). Here expr is the expression (without =0), var is the variable you solve for, guess is you estimate of the solution, lower_limit and upper_limit are the bounds of the domain where you are looking for a solution. Of course your guess must be between theses limits.
  2. The Interactive Solver.
The solve( command

  • The solve command is accessed through the catalog of commands [2nd][0] (CATALOG).
  • Press [LN] (S) to let the cursor jump to the first command that starts with s.
  • Scroll down to reach the solve( command.
  • Select it and press [ENTER]. The command echoes on main screen.
  • Enter the different arguments: expr, var, guess, etc.
  • Close the right parenthesis and press [ENTER].
  • Wait for the solution to be displayed.
The interactive Solver

Press [MATH][0:Solver]. You see what is on the first picture (I entered K-0.5*V^2). Press [ENTER]. You see what is on the right picture.

my solver is giving me the wrong answers - 5a3aa82.jpge9ed008.jpg
In the interactive solver you enter a value for all the parameters, constants, for all, save the entity you are solving for, here V. So you must clear the 0 to the right of the = sign after the V. when finished you press [ALPHA][ENTER] (SOLVE).
Here is what I get for the small exemmy solver is giving me the wrong answers - 7b60093.jpg.

7b60093.jpg
Left -rt=0 shows that the root was found to within the calculator's tolerance.

Hope it helps.
Thank you for using FixYa.

Posted on Dec 10, 2009

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