Question about Casio FX-115ES Scientific Calculator

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How do you enter the problem 11x=10x-17 in the calculator to solve for x.

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  • Andrea Lock
    Andrea Lock May 11, 2010

    Hello

    OK, first you need to balance the equation, thus:

    11X - 10X = 17
    1X = 17

    Now you just divide 17 by 1, thus calculating x. X = 17

    I found a link where you can download the manual for you calculator
    manual for future troubleshooting. Just click on the link which will
    direct you to the page where you can download the manual.http://www.retrevo.com/support/Casio-fx-...
    Hope this can help you. Kind regards Andrea

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  • Casio Master
  • 8,064 Answers

Hello,
If you clean the expression you will find out that you need no calculator to get the solution.
11x=10x-17
11x -10x =10x -10x -17
1x=-17
The solution is x=-17.
Hope it helps.

Posted on Nov 18, 2009

  • 1 more comment 
  • k24674 Nov 22, 2009

    There is a another way if you are adament on using the calculator to solve such a trivial problem. I am giving this solution because it may help others to use the solve ( function on the FX115ES, FX991ES and FX-300ES



    1. Turn calculator ON

    2. Type 11[*][ALPHA] [)] (X) [ALPHA] [CALC] (=) .

    3. The symbol between parentheses is the one accessed by the key combination in square brackets []. The = sign in an algebraic relation is not the same as the one near the [ANS] key, on the last row of the calculator.

    4. Continue by typing 10[*][ALPHA] [)] (X) - 17

    5. Once the equality is entered press [SHIFT][CALC] (Solve)

    6. You are prompted to Solve for X

    7. Press [EXE]

    8. Wait for the calculator to return with the solution.
    For this case the calculator screen displays
    11*X=10*X-17
    X= -17
    L-R= 0

    L-R means that for X=-17, 11X- (10X-17) =0 .

    While this exemple is trivial, the solve( function is very interesting to use to solve algebraic equations. The steps are identical to the ones in the exemple above.


    • The default unknown for the calculator is X.

    • You will be prompted for values of any symbol that is not X.

    • You will be prompted for the values starting from the left. (first symbol will be prompted for before the others --- order of appearance in the equality).

    • If you do not enter a value for a variable (Y) or a parameter, it will have the old value that is stored in it.

    • You can use any expression but the only symbols you can use are X, Y, A, B,C,D ( all letters accessed with the [ALPHA] [Letter] combination.
    Hope it helps.



  • k24674 Nov 22, 2009

    OOPS: if you are adamant.

  • k24674 Nov 22, 2009

    OOPS again. In numbered list # 7. Should be Press [=], not [EXE].

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