Question about Texas Instruments TI-83 Plus Calculator

# It's stuck I was in the middle of typing in an equation and now none of the keys will work

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• Texas Instru... Master

If you fill all the entry line memory, the calculator stops responding. Clear entries to free memory.

Posted on Feb 11, 2016

Hi,
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Goodluck!

Posted on Jan 02, 2017

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### How do i calculate my rational equations using my casio fx-115es for example x/8=8/x

You do not need a calculator for this proportion.
For a proportion a/b=c/d, the product of the extrems (a*d) is equal to the product of the means (b*c).
In your case x*x=8*8 or x^2=64.
The two solutions are x=+square root (64) or x=-square root(64).

For a less trivial equation, you can use the solve feature of the FX-119ES. To do so, use the ALPHA keyboard to enter your equation; once the equation is typed in, do not press the main equal sign, but the Solve key (the key is located near the top left corner of the keyboard). You will be prompted to solve for X?.

Feb 24, 2012 | Casio FX-115ES Scientific Calculator

### Solving linear equations in 3 variables by matrix method in casio fx-115ES

Press key Mode, first select option 5:EQN (by pressing key 5), then option 2: a_nX+b_nY+c_nZ=d_n (by pressin 2).
Now input coefficients from equations in table (each column is for one variable), just type in number and press =, then use arrows to move to another cell.

Sep 02, 2011 | Casio FX-115ES Scientific Calculator

### How do I type an equal sign into the calculator? As in 5x+6=6x-3. I want to put this equation into the calculator, but i cannot figure out how to type and equal sign

Look at the top left corner of the keypad. If you have a = sign marked on the f ace of the calculator (near a CALc or Solve key) you can enter the = by pressing [ALPHA] then the key next to which there is an = sign.
If you do not have that second = sign, you cannot enter it.
The FX-115ES and the FX-991ES do have that sign to allow the user to enter equations. In your calculator you only have three calculational modes: the general COMP mode, the STAT mode and the Table Mode. No equation mode. Sorry.

Aug 30, 2011 | Casio fx-300ES Calculator

### How do I type in the equation .933 ^ 1.5 That

. 9 3 3 x^ 1 . 5

x^ is marked on the keyboard as an x with a superscript rectangle on the key above the sin key. This function lets you raise a value to any number, including 2 and 3.

Sep 06, 2010 | Casio FX-115ES Scientific Calculator

### How do you do algebraic equations and inequalities on this calculator? The keys and the instructions are too small to read.

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.

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

### I need to solve this problem, can anyone help? 2.5/7 = x/10 How do I get this calculator to do it?

It looks like overkill to use the calculator to solve this first order linear equation but I will show you how to use the Solve function available on this calculator.

First solution: Pen and paper.

Use the properties of proportions:
Let a, b, c, and d numbers, with b, and d not equal to 0
if a/b=c/d then a*d=b*c
To apply it to your case, you set a=2.5, b=7, c=x, and d=10.
This gives 2.5*10=7*x
Dividing both members of the equation by 7 yields x=25/7.

Using the SOLVE program
1. Calculator should be in computational mode: Press [MODE][1:COMP]
2. Type in the equation in the way described below:
3. You will need to use the key sequence [ALPHA][CALC] (=) to insert the = sign, the one at the top left, not the one at the bottom right.
4. You will need to use the sequence [SHIFT][CALC] (SOLVE) to order the calculator to start solving your equation.
5. You will need the key sequence [ALPHA] [)] to insert the X variable.
6. Now that you have been alerted to the sequaences you will need, here is how to enter your equation.
7. 2.5/7 [ALPHA][CALC] (=) [ALPHA] [ ) ] (X) /10
8. While the above sequence is in the command line with the cursor still blinking to the right of the 0, press [SHIFT][CALC] to access the (SOLVE) command.
9. The calculator displays in the top line of the dispaly "Solve for X". At the bottom there would be some old (irrelevant value).
10. At this point you are expected to enter a value for your initial guess.
11. You can for example enter 2 and press [=] at the bottom right. If you do not type a guess, the calculator uses the old (irrelevant) value as initial guess.
12. So you enter initial guess 2 and press the [=/EXE] key at the bottom.
13. After a while (could be short , if the initial guess is inspired) the calculator returns with the solution.
14. The solution display screen recalls your equation on the top line,
15. X=3.571428571 on the middle line, and
16. L-R= 0 on the bottom line.
The L-R=0, tells you that the difference between the LEFT side and the RIGHT side of your equation is 0. That means the X given in the second line is the solution within the tolerance of the calculator.

If you are not happy with the solution (L-R different from 0), or the calculator failed to return a solution, you can press [SHIFT][CALC] (SOLVE) to restart with a better guess.

Feb 10, 2010 | Casio FX-115ES Scientific Calculator

### Keys not working!!!

got something stuck under the keyboard keys? Turn the keyboard upside down and give it a good shake.

Check the connection in the back of your PC - make sure none of the pins are bent if it isn't USB.

Feb 28, 2008 | Logitech S 510 (967555) (DH967555)...

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