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How to calculate inverse of a 3x3 matrix in casio fx-991MS calculator?

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  • Casio Master
  • 7,993 Answers

Hello,
Here is the solution for th FX-991ES.
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

how to calculate inverse of a 3x3 matrix in casio - moz-screenshot-1.pngd2bc4ab.jpg
The matrix used in the exemple is
a_11=2 a_12=1 a_21=1 a_22=2
Here is the link to download the manual and the appendix

http://support.casio.com/manualfile.php?rgn=1&cid=004001004
The link is for FX991ES. Look there foe you manual.

Hope it helps


Posted on Sep 07, 2009

  • 1 more comment 
  • Bond7Ghost Oct 12, 2010

    Dont ever watch the question, tweety_aarth asking about 3*3 but you giving the answer for 2*2.
    I too tried the same for 3*3,am always getting float values.
    I need absolute values..

  • k24674 Oct 13, 2010

    I do read the questions, mind you. I used the 2X2 matrix because I could take the picture from the book and insert it, hoping it would help the asker. Besides, if you took the time to learn about matrices, you will discover that the methods are general and what you can do for a 2X2 matrix can be done for a 3X3 or an nXn matrix.
    As to your question, if you had one, try to (re)formulate it so that it makes sense. The absolute value notion can be applied to any real number, regardless of its representation (fraction, decimal, radical), as well as to complex numbers. You came here seeking a solution and it is not wise nor considerate to start with some rubbish such as this "Dont ever watch the question"

  • Waqar Chaudhary
    Waqar Chaudhary Nov 25, 2013

    u can chnage the floating value by prssing s>d button ...

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2_7_2012_12_00_19_am.png
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2_7_2012_12_01_22_am.png
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2_7_2012_12_02_07_am.png
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2_7_2012_12_03_03_am.png
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2_7_2012_12_04_12_am.png
2_7_2012_12_07_37_am.png

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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

moz-screenshot-1.pngd2bc4ab.jpg
The matrix used in the exemple is
a_11=2 a_12=1 a_21=1 a_22=2
Here is the link to download the manual and the appendix

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

Hope it helps

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