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Yes, the Casio fx-991EX scientific calculator has a feature called "natural display" which allows you to input and display mathematical expressions exactly as they appear in textbooks, including variables such as "x".

To perform the calculation you mentioned, 2x * 2 = 4x, simply enter the expression "2x*2" into the calculator, and it will display "4x" as the result. You can then use this result in further calculations without having to enter a value for "x".

To enter the variable "x", you can use the "ALPHA" key followed by the corresponding letter key. For example, to enter "x", press "ALPHA" followed by "X".

Note that if you want to solve for a specific value of "x", you will need to use the solver or equation mode on your calculator to input the equation and specify the value of "x" you want to solve for.

To perform the calculation you mentioned, 2x * 2 = 4x, simply enter the expression "2x*2" into the calculator, and it will display "4x" as the result. You can then use this result in further calculations without having to enter a value for "x".

To enter the variable "x", you can use the "ALPHA" key followed by the corresponding letter key. For example, to enter "x", press "ALPHA" followed by "X".

Note that if you want to solve for a specific value of "x", you will need to use the solver or equation mode on your calculator to input the equation and specify the value of "x" you want to solve for.

Mar 14, 2023 •
Casio Office Equipment & Supplies

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The Calculator does not have a Computer Algebra System (CAS), and cannot perform algebraic operations with variables. However if you enter some expression with variables, it can solve for one unknown after it prompts you for the values of the others

Oct 05, 2012 •
Casio Fx-991es Scientific Calculator

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- You have several memory locations you can use to store values in them. The memory locations are A,B,C,D, M, X, and Y. You use [SHIFT][RCL] and one of the variable names above. Example store 78 in C location: 78 [SHIFT] [RCL] [HYP]. To recall that value press [RCL] [HYP]

- If you want to use the EQN (equation solving mode, press [MODE][5:EQN] then select the equation type . For example [3:aX^2+bX+c=0] will display a template wher you input the three coefficients.

- You can also enter any type of equation and solve it with the SOLVE command. In that case you use the keyboard to enter the expression (see above how to enter variable name X). To type in the equal sign (=) use [ALPHA][ CALC]. Once the whole equation is typed in, press [SHIFT[ [SOLVE], and the calculator will prompt SOLVE for X? Confirm and press the main = sign. Press = again to get a second, a third root (if any)

Jun 06, 2012 •
Casio FX-115ES Scientific Calculator

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This calculator cannot manipulate algebraic expressions. You can enter an expression and generate a table of values. You can enter an equation in one unknown and solve it. But you cannot do algebra.

You would need a calculator that has a Computer Algebra System (Algebra FX 2.0, or ClassPad 300/330). Sorry.

You would need a calculator that has a Computer Algebra System (Algebra FX 2.0, or ClassPad 300/330). Sorry.

May 10, 2012 •
Casio FX-115ES Scientific Calculator

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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

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This will show you how to do statistics (calculate average, standard deviation, regressions etc.) as to the mode and median refer to the definitions.

TO COMPUTE STANDARD DEVIATION AND 2-VAR STATISTICS.

I assume you know the theory. I will show you the key strokes

For 1-Var statistics

Press [MODE][3:STAT] [1:1-VAR]. You are ready to enter values in the X column.

Enter a number and press [=]. Cursor jumps to second number to enter.

Keep entering numbers and pressing [=] till all numbers are in. Press the [=] key after the last one.

**Press
[AC] key to clear the screen.**

Press [SHIFT] [STAT] (above digit 1.) then [5:Var]. Screen displays the statistical variables 1:n ;2: x bar; 3: x sigma n; 4:x sigma n-1.

Press the number corresponding to the statistical value you want, ex 1:n . The variable appears on screen. Press [=] and it will be displayed.

To display another variable press [SHIFT][STAT][5:Var][ 1,2, 3, or 4] .

To access the sum of squares sigma x^2 and the sum of data sigma x press[SHIFT][STAT][4:SUM] then [1: for sigma x^2] or [2: for sigma x]. Press [SHIFT][STAT][6:MinMax] to access minX and maxX.

For 2-var statistics

To perform 2 variable statistics you press [MODE][3:STAT] and any of the other regression options (except 1:1-Var). A two column template opens where you enter the X and Y values. When finished entering data, press [SHIFT][STAT][5:Var]. to access the different statistics. As I assumed above, you should be able to recognize what each variable means.

TO COMPUTE STANDARD DEVIATION AND 2-VAR STATISTICS.

I assume you know the theory. I will show you the key strokes

For 1-Var statistics

Press [MODE][3:STAT] [1:1-VAR]. You are ready to enter values in the X column.

Enter a number and press [=]. Cursor jumps to second number to enter.

Keep entering numbers and pressing [=] till all numbers are in. Press the [=] key after the last one.

Press [SHIFT] [STAT] (above digit 1.) then [5:Var]. Screen displays the statistical variables 1:n ;2: x bar; 3: x sigma n; 4:x sigma n-1.

Press the number corresponding to the statistical value you want, ex 1:n . The variable appears on screen. Press [=] and it will be displayed.

To display another variable press [SHIFT][STAT][5:Var][ 1,2, 3, or 4] .

To access the sum of squares sigma x^2 and the sum of data sigma x press[SHIFT][STAT][4:SUM] then [1: for sigma x^2] or [2: for sigma x]. Press [SHIFT][STAT][6:MinMax] to access minX and maxX.

For 2-var statistics

To perform 2 variable statistics you press [MODE][3:STAT] and any of the other regression options (except 1:1-Var). A two column template opens where you enter the X and Y values. When finished entering data, press [SHIFT][STAT][5:Var]. to access the different statistics. As I assumed above, you should be able to recognize what each variable means.

Apr 19, 2011 •
Casio FX-115ES Scientific Calculator

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I am not quite sure what you mean by ``solve f(x)=100x-64*x^2+48*x^3 for different value of x``. Do you want to find the roots of the cubic equation 0=100x-64*x^2+48*x^3 , or do you want to generate values of f(x) for different values of the variable x.

For the first case, use the SOLVE program,

for the second, use the TABLE computational mode: Press MODE and select TABLE, then enter the expression to the right of the equal sign. In TABLE, X is the default variable.

For the first case, use the SOLVE program,

for the second, use the TABLE computational mode: Press MODE and select TABLE, then enter the expression to the right of the equal sign. In TABLE, X is the default variable.

Apr 12, 2011 •
Casio FX-115ES Scientific Calculator

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Some
keys have a letter of the alphabet next to them. The letters are A,
B,C,D, M, X, Y. They correspond to memory registers (memory locations)
in which you can store values.

To enter a letter as when you are entering an expression with variables, you press the [ALPHA] key followed by the key next to which is the letter you seek. To enter letter A, You press [SHIFT] [(-)] if I am not mistaken.

If you want to solve an equation (solve for X by default) press SHIFT (Solve) not the = sign at the bottom of screen.

To enter a letter as when you are entering an expression with variables, you press the [ALPHA] key followed by the key next to which is the letter you seek. To enter letter A, You press [SHIFT] [(-)] if I am not mistaken.

If you want to solve an equation (solve for X by default) press SHIFT (Solve) not the = sign at the bottom of screen.

Feb 26, 2011 •
Casio FX-115ES Scientific Calculator

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The calculator does not have a CAS (Computer Algebra System). Therefore it cannot do symbolic algebra. It can only calculate numerical values.

You can enter algebraic expressions with symbols (X, variable), Y, A,B,C,D, and M but they will just be evaluated with the current values of A, B,C,D, Y, and M. If you use the SOLV program the unknown variable must be X.

You can enter algebraic expressions with symbols (X, variable), Y, A,B,C,D, and M but they will just be evaluated with the current values of A, B,C,D, Y, and M. If you use the SOLV program the unknown variable must be X.

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

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Rename your variable (unknown) X, because the calculator takes X as the default unknown. It will ask you "Solve for X?"

the 7, the second minus sign, 3 and 11 use the relevant keys.

For the first minus sign use the negation key or change sign (-)

For the variable X, examine the calculator keys on the row where the parentheses are. To the right corner of the key area there is a symbol in the same color as the ALPHA key. I believe the X is under the right parenthesis, or thereby.

To enter the X variable you press [ALPHA][ )]. To enter the = sign, you press [ALPHA] [CALC].

To execute the solve command, press [SHIFT] [CALC] and you will be prompted " Solve for X?"

the 7, the second minus sign, 3 and 11 use the relevant keys.

For the first minus sign use the negation key or change sign (-)

For the variable X, examine the calculator keys on the row where the parentheses are. To the right corner of the key area there is a symbol in the same color as the ALPHA key. I believe the X is under the right parenthesis, or thereby.

To enter the X variable you press [ALPHA][ )]. To enter the = sign, you press [ALPHA] [CALC].

To execute the solve command, press [SHIFT] [CALC] and you will be prompted " Solve for X?"

May 05, 2010 •
Casio FX-115ES Scientific Calculator

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Usually answered in minutes!

6*n=?

i have entered the 6 into my calculator and puched the x button..ow wat? how do i get the (n) into the calculator?

how do i solve a quadratic equation then? ....without using a variable to solve.

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