Question about Casio FX-115ES Scientific Calculator

I need to solve the f of x problems but I can't find an option to do it!! thanks 4 ur help!!

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CANDYMANGANDY

Posted on Jan 27, 2009

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Posted on Jan 02, 2017

Yes it can be keyed in.

To enter the X, use the ALPHA followed by ). To enter the = sign, you use [ALPHA][CALC].

To use the calculator to SOLVE an equation you must enter the equation, then press [SHIFT][CALC] to (SOLVE). You will be prompted to solve for X. Follow it from there.

As to the case you show, the constant terms will drop and you are left with 26X=0, and the solution is X=0.

**Note: The calculator cannot do algebra with letter symbols. It does not have a Computer Algebra System or CAS.**

To enter the X, use the ALPHA followed by ). To enter the = sign, you use [ALPHA][CALC].

To use the calculator to SOLVE an equation you must enter the equation, then press [SHIFT][CALC] to (SOLVE). You will be prompted to solve for X. Follow it from there.

As to the case you show, the constant terms will drop and you are left with 26X=0, and the solution is X=0.

Mar 28, 2012 | Casio Office Equipment & Supplies

Put the calculator in the COMP mode. Use the ALPHA key to enter the X symbol in the square roots: ALPHA [)] to type X. Use the ALPHA key to type in the = sign (ALPHA CALC). Compose your expression

**Sqr(50*X)-Sqr(8*X)=1**

While the equation is still on the command line, press SHIFT CALC to (SOLVE).

You will see Solve for X.

Press the = sign at the bottom right. Wait for the solution to appear.

You will see Solve for X.

Press the = sign at the bottom right. Wait for the solution to appear.

Jan 31, 2012 | Casio FX-115ES Scientific Calculator

Having gone over two months without a response, I assume my suggestion to adjust the screen contrast solved the problem.

Feb 07, 2011 | Texas Instruments TI-84 Plus Calculator

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

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.

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

- Calculator should be in computational mode: Press [MODE][1:COMP]
- Type in the equation in the way described below:
- 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.
- You will need to use the sequence [SHIFT][CALC] (SOLVE) to order the calculator to start solving your equation.
- You will need the key sequence [ALPHA] [)] to insert the X variable.
- Now that you have been alerted to the sequaences you will need, here is how to enter your equation.
- 2.5/7 [ALPHA][CALC] (=) [ALPHA] [ ) ] (X) /10
- 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.
- The calculator displays in the top line of the dispaly "Solve for X". At the bottom there would be some old (irrelevant value).
- At this point you are expected to enter a value for your initial guess.
- 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.
- So you enter initial guess 2 and press the [=/EXE] key at the bottom.
- After a while (could be short , if the initial guess is inspired) the calculator returns with the solution.
- The solution display screen recalls your equation on the top line,
- X=3.571428571 on the middle line, and
- L-R= 0 on the bottom line.

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

Hi,

**You can use algebra to solve it.**

Use the fact that 4 =2^2 and 8=2^3 and substitute in the equation

(2^3)^x =2^(3*x)

Then** 2^(3*x)=2^2**

By equating the exponents

3x=2 and**x=2/3**

**Using the solve( function**

With the calculator physical keys between square brackets, and the SHIFTed or ALPHA keys between parentheses, type in the following

8 [^ ] [ALPHA] [ ) ] (X) [ALPHA][CALC] ( =) 4 [SHIFT][CALC] (SOLVE)

Once the foregoing command entered press [=]

Display shows**Solve for X** on top line and probably **0.000** on bottom line.

Press [.] 5 to give 0.5 as a guess for the value of x

After a moment the calculator returns with the solution.

The display shows three lines

1st Line: 8[^] X =4

2nd Line: X= 0.66666666

3rd Line : L-R =0.

Your solution is 0.6666666. In fact the exact solution is 2/3.

Hope it helps.

Thank you for using FixYa and for rating this solution.

Use the fact that 4 =2^2 and 8=2^3 and substitute in the equation

(2^3)^x =2^(3*x)

Then

By equating the exponents

3x=2 and

With the calculator physical keys between square brackets, and the SHIFTed or ALPHA keys between parentheses, type in the following

8 [^ ] [ALPHA] [ ) ] (X) [ALPHA][CALC] ( =) 4 [SHIFT][CALC] (SOLVE)

Once the foregoing command entered press [=]

Display shows

Press [.] 5 to give 0.5 as a guess for the value of x

After a moment the calculator returns with the solution.

The display shows three lines

1st Line: 8[^] X =4

2nd Line: X= 0.66666666

3rd Line : L-R =0.

Your solution is 0.6666666. In fact the exact solution is 2/3.

Hope it helps.

Thank you for using FixYa and for rating this solution.

Dec 03, 2009 | Casio FX-115ES Scientific Calculator

http://support.casio.com/pdf/004/fx-115ES_991ES_Eng.pdf

Refer to page 12 of the manual under Inputting expressions and values. It is pretty straight forward if you need further assistance please let me know.

Thank you,

Lee

Refer to page 12 of the manual under Inputting expressions and values. It is pretty straight forward if you need further assistance please let me know.

Thank you,

Lee

Nov 17, 2009 | Casio FX-115ES Scientific Calculator

The calculator only displays from -10 to 10 on the x and y axes, and both of your lines are outside of that range. However, it is easy to change that.

1. Hit the gray "WINDOW" button that is directly under the screen

2. Change "Xmax" to 150

3. Change "Ymax" to 200

Remember to change both of those values back to 10 when you are done with this problem!

Here's how to graph it:

1. Hit the "Y=" button

2. Enter your first equation after Y1, and your second equation after Y2

3. Look over both the equations to make sure you typed them correctly

4. Hit the "GRAPH" button

5. If you don't see the intersection you will need to adjust Xmax and Ymax again

6. Hit Hit "2ND" and the "TRACE" to bring up the "CALC" menu

7. Scroll down to "intersect" and hit enter

8. Hit enter 3 times (You use the first and second curve options when you have more than 2 lines)

9. It should display the coordinates at the bottom

10. I got (76, 142.1) for the intersection

Thanks for asking this question! I used to do this a much harder way, but while I was calculating the answer to your question I hit a wrong button and accidentally found this method!

1. Hit the gray "WINDOW" button that is directly under the screen

2. Change "Xmax" to 150

3. Change "Ymax" to 200

Remember to change both of those values back to 10 when you are done with this problem!

Here's how to graph it:

1. Hit the "Y=" button

2. Enter your first equation after Y1, and your second equation after Y2

3. Look over both the equations to make sure you typed them correctly

4. Hit the "GRAPH" button

5. If you don't see the intersection you will need to adjust Xmax and Ymax again

6. Hit Hit "2ND" and the "TRACE" to bring up the "CALC" menu

7. Scroll down to "intersect" and hit enter

8. Hit enter 3 times (You use the first and second curve options when you have more than 2 lines)

9. It should display the coordinates at the bottom

10. I got (76, 142.1) for the intersection

Thanks for asking this question! I used to do this a much harder way, but while I was calculating the answer to your question I hit a wrong button and accidentally found this method!

Jun 30, 2009 | Texas Instruments TI-84 Plus Calculator

You are probably entering the equation wrong. Dont do this: 3600=x(2+2) You have to enter the equation 3600=x*(2+2)

May 28, 2008 | Texas Instruments TI-89 Calculator

Need to use both instructions for fx-83 fx-85 calc. as i never had them from my children who no longer use the calc.

manojgand@hotmail.com

manojgand@hotmail.com

May 05, 2008 | Casio fx-300ES Calculator

k.....so i had the same problem but i figured out whats up...

if you find another 89 that is the same model....for example if you have a titanium.....find another titanium....and get a var link cable and plug em in to both calcs......

on the one that is working hit 2nd "-" to open up varlink.

hit F3 to open up "link" and highlight send OS but dont send it yet.

On the calc that isnt working correctly open up varlink (2nd "-") and hit F3 and highlight and click recieve OS.

Then on the calc that is working click send OS.

THis will erase your applications like notefolio and other things but once your calc recieves the OS you can go back to varlink and send all the "flashapp" files.

Just make sure when you use varlink you always click recieve before you send it.....otherwise it will give you an error.

hope this helps

-jason

if you find another 89 that is the same model....for example if you have a titanium.....find another titanium....and get a var link cable and plug em in to both calcs......

on the one that is working hit 2nd "-" to open up varlink.

hit F3 to open up "link" and highlight send OS but dont send it yet.

On the calc that isnt working correctly open up varlink (2nd "-") and hit F3 and highlight and click recieve OS.

Then on the calc that is working click send OS.

THis will erase your applications like notefolio and other things but once your calc recieves the OS you can go back to varlink and send all the "flashapp" files.

Just make sure when you use varlink you always click recieve before you send it.....otherwise it will give you an error.

hope this helps

-jason

Sep 17, 2007 | Texas Instruments TI-89 Calculator

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