Question about Casio FX-115ES Scientific Calculator

2 Answers

How do you enter the equation 4(5x+3)=2(7x+6) in the calculator?

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  • rossdm1 Nov 18, 2009

    When I printed the manual page 12 shows correcting an expression. I went to the section varibles and varible overview and tried entering the equation as was not sucessful.

  • rossdm1 Nov 18, 2009

    How do you put the (--) symbol in? When I add it in the equation and press =, I get an error message.

  • rossdm1 Nov 18, 2009

    Simplifying Algegraic Expressions



    Solving equations: Review of the addition and multiplication properties



    Integrated Review-Expressions and Equations



    Solving linear Equations in one Varible



    Linear Equations in One Variable and Problem Solving

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2 Answers

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  • Casio Master
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Hi,
I assume that if you want to enter this equation in the calculator it is for the purpose of solving it for X. In other words you want to use the solve( function. There is no other purpose because it will be erased when calculator is turned OFF.

Here is how you use it.

Use the ALPHA key to enter X, Y, A,B,C,D, = (different from the normal =, which tells calculator to give the result)

  1. Enter an equation, say Y=A*X^2-0.5*X+ B. To enter the = sign in this expression, use [ALPHA][SOLVE] (=)
  2. By default the unknown is X.
  3. 2. Before pressing anything else press [SHIFT][Solve]
  4. You are prompted for the values by order of first appearance (Y, then A, then B).
  5. You will not be prompted for X, because it is the unknown by default.
  6. At the prompt Y? :enter the value of Y and press =
  7. At the prompt A? : enter the value of A and press =
  8. At the prompt B? :enter the value of B and press =
  9. Then the screen displays SOLVE for X with some other value on second line.
  10. Enter your estimate (your guess) and press =
  11. If it comes back with cannot solve, restart with same values, but give a better guess for X.

When a solution is found the screen displays on 3 lines
The equation you entered : Y=
The value of X : X=
L-R (left member - right member) = 0 or a very small number.

For your particular example you enter 4(5x+3)=2(7x+6) as
4*(5* [ALPHA] X +3) [ALPHA][CALC] (=) 2*(7*[ALPHA] X + 6).

The [ALPHA][CALC] (=) is the = sign on the top left corner of the calculator, under (below) the [SHIFT key.

If you press [SHIFT]CALC] (SOLVE) just after entering the function, you will be asked a question Solve for X You will not be prompted for anything because all you coefficients are numbers. The equation will remain in memory until you turn calculator OFF.

Hope it helps.
Thank you for using FixYa and for rating this solution.

Posted on Nov 30, 2009

  • k24674 Nov 30, 2009

    The third line in the numbered list should be
    3. Before pressing anything else press [SHIFT][CALC] (Solve) .

    Note primary keys are between square brackets [ ] and and shifted or ALPHA functions are between parentheses ( )


  • k24674 Nov 30, 2009

    OOPS On first line of numbered list, should read "use [ALPHA][CALC] (=) "

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  • Master
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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

Posted on Nov 17, 2009

  • 1 more comment 
  • Lee A.
    Lee A. Nov 18, 2009

    it would be page e-10 if your going by the manual numbering.
    Thanks,
    lee


  • Lee A.
    Lee A. Nov 18, 2009

    I'm sorry what symbol are you referring to? do you know the name of the math you are trying to do? This may help me solve your problem quicker.
    Thanks,
    Lee


  • Lee A.
    Lee A. Nov 18, 2009

    Sorry I am much more familiar with TI calculators.
    You should be able to use your calculator to check the solution, as follows:
     Most calculators have the ability to store a number in memory. You may
    need to ask your teacher or read the instruction manual to learn how to do
    this.
    For example, on the TI-83 calculator, you would compute the number, press
    the STO. key, press the X,T,’,n key, and then press the ENTER key.
    To recall the stored number, press the X,T,’,n key.
     Calculate the number 8
    15 , and store it in x .
     Calculate the left side of the original equation, using your stored number
    x : 2x € 3 + x . You should get €1:4.
     Calculate the right side of the original equation, using your stored number
    x : 5 € 4x € 8x . You should get €1:4.
     If the left and right sides of the equation give the same result, then your
    solution is correct!
    Hope this helps.
    Thanks,
    Lee


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3_3_2012_5_25_37_pm.jpg

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