# Solver mode in equations part of calculator

On solver mode I only get one possible answer for the equation I type in, when there are sometimes two. What am I supposed to do to get both possible answers?

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Your Solver is a numerical solver not a symbolic one. You have to supply an initial guess at a solution and the Solver finds it. If you suspect, or know, that there are others jut run the solver again supplying the initial guess for each additional solution.
One easy way to locate the roots of an equation is to draw the function (without =0) and see on the graph the approximate values of x where the function vanishes. These approximate values of the roots can be used as initial guesses in the Solver.

Posted on Jan 01, 2010

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Posted on Jan 02, 2017

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### On the TI83 calculator the equation solver dont workequation solver dont work

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.
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Calculators come in multiple shapes and makes. It would certainly be helpful to know a calculator's manufacturer and Model number.

The Simul button allows you to use a solver of simultaneous linear equations.
You must have enter one of the simutaneous equation solver.
Enter the value of a_1, press =. For each symbol with a ? enter a number and press =

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You must get out of this mode to do other types of calculations. Read your user's guide to know how.

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### 2c + 6 + 7c = 8

To solve this with a ti-84 press [math] and select solve from the menu. This will open the equation solver. Type in your equation
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This calculator doesn't really support a solver like that. You can use Woflram Alpha to solve equations like that really quickly. Example
There are more expensive calculators that will solve these types of equations, but I would recommend just using Wolfram Alpha whenever you need a solution to a math problem.

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1. solve(
2. Simult(
However if you are looking for the simultaneous equation solver application, you can download it from the TI website. Here is the link

If you need download and install instructions, you will find them here.

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### Solver not working properly

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

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