Casio fx 991 ES PLUS feature

Thread starter Raghav Gupta
Start date Sep 3, 2015
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Casio

In summary, the Casio fx 991 ES PLUS calculator has various features such as basic arithmetic operations, advanced functions, matrix and vector calculations, statistical calculations, and a natural textbook display. To access the matrix and vector functions, press the "MODE" button and navigate to the desired option. The calculator can also perform complex number calculations by accessing the "Cplx" mode. To use the statistical functions, press the "STAT" button and select the desired function. The calculator also has a multi-replay function for saving and recalling previous calculations.

Sep 3, 2015

Raghav Gupta

How can we solve equation with 4 variables in this calculator?
For 3 it solves in equation mode. Or the 4x4 matrix is not there?

Can the calculator show graphs?

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Sep 3, 2015

CalcNerd

Education Advisor

Gold Member

4x4 matrix is NOT there. Nor are there any graphing features, the dot matrix display allows for viewing equations.

Last edited: Sep 3, 2015

1. What are the main features of the Casio fx 991 ES PLUS calculator?

The Casio fx 991 ES PLUS calculator has a wide range of features, including basic arithmetic operations (addition, subtraction, multiplication, division), advanced functions (trigonometry, logarithms, exponential functions), matrix and vector calculations, and statistical calculations. It also has a natural textbook display, allowing users to input and view equations and expressions just as they would appear in a textbook.

2. How do I access the matrix and vector functions on the Casio fx 991 ES PLUS?

To access the matrix and vector functions, press the "MODE" button and navigate to the "Mat" or "Vec" options using the arrow keys. Press "ENTER" to select the desired option and then use the arrow keys to input the values for your matrix or vector. Press "SHIFT" and then the corresponding number key to perform operations on the matrix or vector.

3. Can the Casio fx 991 ES PLUS perform complex number calculations?

Yes, the Casio fx 991 ES PLUS has a complex number mode that allows for calculations involving real and imaginary numbers. To access this mode, press the "MODE" button and navigate to the "Cplx" option using the arrow keys. Press "ENTER" to select the option and then use the arrow keys to input the real and imaginary parts of your complex numbers.

4. How do I use the statistical functions on the Casio fx 991 ES PLUS?

The Casio fx 991 ES PLUS has a variety of statistical functions, including mean, standard deviation, and regression. To access these functions, press the "STAT" button and use the arrow keys to navigate to the desired function. Press "ENTER" to select the function, and then input the necessary values using the arrow keys. Press "SHIFT" and the corresponding number key to perform the calculation.

5. Can I save and recall previous calculations on the Casio fx 991 ES PLUS?

Yes, the Casio fx 991 ES PLUS has a multi-replay function that allows users to save and recall up to 10 previous calculations. To save a calculation, press the "SHIFT" and "RCL" buttons simultaneously. To recall a saved calculation, press the "RCL" button and then use the arrow keys to navigate to the desired calculation. Press "ENTER" to recall the calculation.