Question about Casio FX9750GII Graphic Calculator

# Casio fx9750gii I need to know how to solve for a three variable, system of equations problem for my algebra 2 class and i would like to know how to do that with my "fx-9750GII" calculator

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Here how it is done. Don't mind the calculator it was done on. On your you may have systems of up to 3 linear equations.
Follow the screen captures. I do not think any additional comments are warranted. Pressing the F1 key (REPT)-- see last screen capture--allows the user to repeat the solution with the same coefficients or other ones (different system)

Posted on Oct 11, 2013

Hi,
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Posted on Jan 02, 2017

Mode>choose "5"
choose equation format "4"
input the coefficient for a which is "1" and hit "="
input the coefficient for b which is "4" and hit "="
input the coefficient for c which is "3" and hit "="
input the coefficient for d which is "12" and hit "="
Hit "=" for X1
Hit "=" again for X2
Hit "=" again for X3

Posted on Oct 20, 2008

Enter your number then press (shift) then (X10x) key. That will enter pi. then press (=) for the answer.

Posted on Jul 05, 2009

Hello,

The error may be due to the key you used to signifie inverse. It says in the manual that you should use the key x^-1 not the one used to input general powers.
Here is screen capture from the Appendix to the manual. The picture shows the sequence of keys to press to obtain the inverse of a 2x2 matrix. It is taken from page 41 of Appendix

The matrix used in the exemple is
a_11=2 a_12=1 a_21=1 a_22=2

http://support.casio.com/manualfile.php?rgn=1&cid=004001004

Hope it helps

Posted on Sep 06, 2009

Hello,
Turn calculator ON. If you do not see several icons press [MENu].
Use arrow to select the [GRAPH] application and press [EXE].
In the entry screen, the line with Y1= is highlighted. If it is not, use arrow to highlight it.
Press the right arrow, the highlighting disappears leaving you with Y1= and the blinking cursor.
At the position of the cursor enter 5 [X, theta,T] key under the [ALPHA]. On the screen appears 5X, complete you equation +2.
Press [EXE] to store function.
If you want to draw other functions, it is time to do so on that screen.
When done press [F6:Draw}.
If the screen does not show a lot of the function, you can use the arrow keys to pan the graph.
You can also press [SHIFT][V-Window] to set the window limits.

Hope it helps.

Posted on Oct 11, 2009

Testimonial: "Thank you so much!!!"

Hello,
There is a function to calculate them for you.

In CAS, or Algebra or Tutor Modes, use the x! option
In Run-Math, press [OPTN][F6] to pan right, then [F1] to access the (PROB) menu then enter option number corresponding to x!
The way it works is as follows
number ! [EXE].
Due to memory limitations, you can calculate factorials of numbers up to 69.

Hope it helps.

Posted on Nov 13, 2009

Testimonial: "Thanks. Ended up finding it after searching around for 20 minutes. Appreciate the help though!"

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## Related Questions:

### How can i solve derivative for the ex? Ex: f(x) = (x^2+3x)^3 (easy one, want to know how to get it on the calculator without defining a value for X) Cheers

The calculator can calculate numerical values of derivatives of functions (at a given point). It does not have a Computer Algebra System so what you want to do cannot be done. You should look for a Casio calculator with a CAS, such as the ClassPad, the FX_Algebra 2 or the FX 9860G. Sorry.

Aug 23, 2013 | Casio FX9750GII Graphic Calculator

### I want to solve an complex equation on casio fx-570 ES Plus

Your scientific calculator is unable to solve complex equation with complex coefficients. You should try to solve by hand directly using the quadratic formula or by factoring the polynomial in z
failing that, another way would be to set z=x+iy, substitute this for z, carry out the algebra and try to separate real and imaginary parts. But your two equations will constitute a system of two quadratic equations. I am not aware of any general method to solve coupled nonlinear equations.
Good luck.

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### How we can multiply two algebraic equation in 991 ES CASIO calculators

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

### How would i solve for an expression and be able to leave it in terms of the variable, like (2a-1)(8a-5) and get the answer with the variable in it

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.

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

### Edit Casio FX - 9860G SD have complex equations??

Thhe Casio FX-9860G SD can solve a polynomial equation of degree 2 or 3 with REAL coefficients. If the complex MODE is set to REAL it will find the real roots. If the complex mode is set to a+ib, it will find the real and complex roots.

Apparently it will take coefficients that are real, and will give a Ma Error if any coefficient is complex.

The calculator CANNOT solve equations with complex coefficient. YOU can however convert the system of linear equations with ccomplex coefficients ( of the type you show) as a system of 4 linear equations in 4 unknowns; Split x into a real and an imaginary part, split y into a real and an imaginary part. Substitute Real(x)+iIm(x) for variable x in the equations; substitute Real(y)+iIm(y) for y in the two equations; do the algebra. In each of the original equations split the Real and imaginary parts. You should be able to derive 4 linear equations in unknowns Real(x), Im(x), Real(y), and Im(y).
Use the linear equation solver to obtain the solutions. Recompose x=Real(x)+iIm(x), and y=Real(y)+iIm(y)

Alternatively, after you create the system of 4 linear equations you can use the matrix utility to find Real(x), Im(x), Real(y) and Im(y) and recompose the x and y.

Mar 17, 2012 | Casio FX-9860G Graphic Calculator

### Casio FX - 9860G SD have complex equations?? edit

The Casio FX-9860G SD can solve a polynomial equation of degree 2 or 3 with REAL coefficients. If the complex MODE is set to REAL it will find the real roots. If the complex mode is set to a+ib, it will find the real and complex roots.

Apparently it will take coefficients that are real, and will give a Ma Error if any coefficient is complex.

The calculator CANNOT solve equations with complex coefficient. YOU can however convert the system of linear equations with ccomplex coefficients ( of the type you show) as a system of 4 linear equations in 4 unknowns; Split x into a real and an imaginary part, split y into a real and an imaginary part. Substitute Real(x)+iIm(x) for variable x in the equations; substitute Real(y)+iIm(y) for y in the two equations; do the algebra. In each of the original equations split the Real and imaginary parts. You should be able to derive 4 linear equations in unknowns Real(x), Im(x), Real(y), and Im(y).
Use the linear equation solver to obtain the solutions. Recompose x=Real(x)+iIm(x), and y=Real(y)+iIm(y)

Mar 17, 2012 | Casio Office Equipment & Supplies

### Solve and check using elimination methodx+y=10 x-y=-6

Apply what you learned, especially that this system is quite simple.
Elimination
1. entails eliminating one variable to find (in this case) a single equation involving the other variable.
2. Solve that new equation, meaning isolate the variable that was not eliminated.
3. Substitute the value found in the last step and replace it in one of the original equation to obtain the other variable.

x+y=10
x-y=-6

Add the left sides to get x+y+x-y=2x
Add the right sides of the system to obtain 10+(-6)=4
Write Sum of left sides =Sum of right sides or 2x=4.
Since this new equation involves only x, you can solve it for x, getting x=4/2=2
Now you know the value of x (=2)
Take one of the original equations (for example x+y=10) and put 2 in place of x.
The equation becomes 2+y=10
Solve it to obtain y=10-2=8
Thus your solution is x=2, y=8

Check: use one equation in which you substitute 2 for x and 8 for y: x-y=-6 becomes 2-8=-6
Verified.
In the general case you will have to multiply by certain values to obtain opposite coefficients for the same variable. Here that was not necessary because the coefficient of y is 1 in the first equation and -1 in the second.

Aug 16, 2011 | Casio Office Equipment & Supplies

### How do I enter a polynomal into the calculator. I need to be able to do factors with letters in it

Well, the short story is that this calculator cannot do symbolic algebra: it does not have a CAS (Computer Algebra System). However you can enter symbolic expressions using the variables A,B,C,E, X and Y. Use the sequence [ALPHA] [A] to enter the letter A, etc. To type in the symbolic = sign, use the [ALPHA] followed by the key at the top left corner of the keypad that has an = next to it.

When you enter an equation (two expressions linked by an =), press [ALPHA][SOLVE] to solve the equation for tha unknown X. You will be prompted to enter the values of all other letter symbols : A,B,C, D, Y, etc. When all symbols (except X) have been given a value the calculator will find the value of X that satifsfies the equation.

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### I m unable to multiply two 4 cross 4 matrix ,how to solve this problem?

This calculator cannot handle matrices that have anyone dimension larger than 3.

1. Set up the problem by hand (pencil paper): use Cramer's rules. Make use of the calculator to perform the various calculation.
OR
1. Sacrifice one equation which you will use to eliminate one variable of the 4 by expressing it in terms of the other three. Do the algebra to obtain a system of 3 equations in three unknowns.
2. Use the calculator to find the solutions ( the three variables that are left).
3. Use the 4th equation (the one you scacrificed) to obtain the value of the 4th unknown.
OR

use a computer program devoted to solving linear equations

OR buy another calculator that can handle larger systems of equations (a graphing calculator, maybe).

Feb 16, 2011 | Casio FX-115ES Scientific Calculator

### How can i do algebra and keep the pronumerals and not use the inputted number? I am using the latest casio, it is a scientific calculator (not sure which model)

It is always risky to try to answer a question about a calculator of an undisclosed model.
To be able to symbolic algebra (with variables), one needs a calculator with CAS (or Computer Algebra System). These types of calculators are special graphing calculators. ( Not all graphing calculators have a CAS.)

To get back to your question: No, you cannot do algebra with a mere scientific calculator even a recent one. All you can do is define an equation with variables A,B,C,D, Y and X and press the Solve button if it exists. The calculator will ask: Solve for X?. If you say yes, you will be prompted for the values of all letters (A,B,C,D, Y) in your equation and the calculator will search for the value of X, that makes the left side of your equation equal to the right side.

It will display the X-value and the difference L-R.

Oct 31, 2010 | Casio FX-115ES Scientific Calculator

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