Question about Casio FX-115ES Scientific Calculator

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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



2 Answers

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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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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,

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.

  • 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.

  • 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
    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.



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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.
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How do I get the fx-115es to solve this equations 2(4a-9)+3=5a-6

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2c + 6 + 7c = 8

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What is the equation of the pair of points (-5,-8) and (-3, -1)

The site seems to eat the plus signs I enter, so I will use PLUS to symbolize addition.

To find the equation of the straight line (
y = a*x PLUS b) that passes through two points P1(x1,y1) and P(x2,y2) , you need to use
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To find b, substitute the coordinates of one of the points in the equation. Let us do it for (3,6).

The point (3,6) lies on the line, so 6=(1/2)*3 PLUS b.
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I trust you can substitute you own values for (x1,y1, x2,y2) to duplicate the calculations above.

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Hope it helps.

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At first you have to slving this equations in explicit form y=f(x) and the graphing it. See captured images



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