Question about Casio FX-115ES Scientific Calculator

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Trying to get the inverse of a matrix

I'm trying to get the inverse matrix of my 3X3 matrix in order to solve a system of equations. If I type MatA^(-1) on my FX-115ES it gives a syntax error? Im trying to multiply MATA^-1 * MATB to solve three variables- I could do this with my TI-85, am I doing something wrong to get it to work on the Casio? thanks

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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

Trying to get the inverse of a matrix - 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

Posted on Sep 06, 2009

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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,
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

moz-screenshot-1.pngd2bc4ab.jpg
The matrix used in the exemple is
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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


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