# Top 10 Casio FX-115ES Scientific Calculator Questions & Answers

## Question

• 20,176 People Helped

### how to calculate inverse of a 3x3 matrix in casio

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

Posted by on

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

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
The link is for FX991ES. Look there foe you manual.

Hope it helps

Posted on Sep 07, 2009

## Question

• 15,864 People Helped

### How do you use the pol and rec

How do you use the pol and rec

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To avoid errors make sure that the angle unit is THE ONE required by your problem. To verify or to change the angle unit press [SIFT][MODE] and select [3: Deg] for degrees, [4:Rad] for radians, or [5:Grad] for grads.

Convert from rectangular to polar

[SHIFT][+] (Pol) . Screen displays Pol(
You enter the X-coordinate, and the Y coordinate separated by a comma, then you close the parenthesis and press [=].

Exemple: Polar coordinate of the point (1,1)
Pol( 1, 1) gives
r=1.414213562 (square root of 2)
θ=45

Here is how you enter it
Press [SHIFT][MODE][2:LineIO]
[SHIFT][POL] 1 [SHIF] [,] 1 [)] [=]

The screen displays
Pol(1,1)
r= 1.414213562
θ= 45

Convert from polar to rectangular coordinates

Exemple: Recatngular coordinates of (r=3, θ=60°)
[SHIFT][Rec] 3 [SHIFT][,] 60 [ ) ] [=]
The screen displays
Rec(3,60)
X= 1.5
Y= 2.598076211

Posted on Jan 20, 2010

## Question

• 12,572 People Helped

### how to interpolate in CASIO

how to interpolate in CASIO fx 991 ES

Posted by on

its simple
press mode
3;stat
2;A+Bx
l x l y l
l 2 l 4.6 l
l 4 l 5.9 l
press; AC
press;5.9
press; shift
press;1
press;7 (reg)
press;5 (comma)
press;=
u will get ans

Posted on Nov 07, 2012

## Question

• 11,848 People Helped

### how to write log base 2 in casio fx-82MS

how to write log base 2 in casio fx-82MS

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With log a / log b = loga (b) formula

In casio for log2 8 = log8 / log 2 = 3

Posted on May 19, 2010

## Question

• 10,732 People Helped

### how to get the inverse of a matrix an fx-991 ES

how to get the inverse of a matrix an fx-991 ES calculator

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The same way you would get the inverse of a number. Assuming you already have the matrix entered into memory, press SHIFT 4 to bring up the matrix menu, select the matrix whose inverse you want, then press the x^-1 key (just to the right and slightly below the big round cursor pad.

Posted on Nov 02, 2010

## Question

• 10,192 People Helped

### How do you reset the casio fx-115es

How do you reset the casio fx-115es

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Next to the digit 9 key or ( there is a marking on the calculator that says CLR. To clear calculator (reset) press [SHIFT] (CLR) [=]. You will have to confirm the resetting.

Posted on Sep 06, 2010

## Question

• 9,029 People Helped

### How to convert polar to rectangular form

How to convert polar to rectangular form

Posted by on

Hello,
Press [MODE] and select [1:COMP]
Press [SHIFT][MODE] and select [3:Deg]. You can also use rad if the angle you are given is in radians.
To start the conversion
Press [SHIFT][-] (Rec) screen displays Rec(
Key in the radius r , ex: 3 screen displays Rec(3
Press [SHIFT][)] (,) to enter comma separator Rec(3,
Key in the angle in degrees, ex: 57.3; screen displays Rec(3,57.3
Press ) to close parentheses; screen displays Rec(3, 57.3)
Press [=]
Screen displays
Rec(3, 57.3)
X=1.620720961
Y=2.524532346

X and Y are the values of the coordinates.

Rec(3, Pi) gives X=-3, Y=0
Hope it helps

Posted on Oct 18, 2009

## Question

• 8,751 People Helped

### how to calculate 0.3log(base 2)0.3 using fx-991ms

how to calculate 0.3log(base 2)0.3 using fx-991ms calc

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Your calculator knows only the decimal logarithms log or log_10 and the natural logarithms (ln or log in base e).
So you cannot compute directly the logarithms in any bases other than 10 and e.
A workaround consists in using the relation
log_b(a)= (log_10(a) ) / (log_10 (b))
or the relation
log_b(a)= ln(a)/ln(b)

Similarly
log_2(0.3)=ln(0.3)/ln(2)
As to the multiplicative factor you had at the beginning of your expression, just multiply the value obtained by one on the formulas above (both formulas will give the same result) by 0.3

Posted on Jul 24, 2010

## Question

• 8,479 People Helped

### how to interpolate with 991MS

how to interpolate with 991MS

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i am giving the key input with an example..
example-
at 0, value is 300
at 50, value is 270
so how much at 30...

On 991MS,

Enter the values as follows,

0,300 and press M+ key on the calci
(Note: there is a "," in between 0 and 300)

then enter the following,
50,270 and press M+ key

now enter the following input exactly as displayed below:

(30) shift 2 > > > 2 =

you will get the answer as 282.

I hope you got it!!!

LOFT!!!

Posted on Mar 02, 2011

## Question

• 8,044 People Helped

### how to turn off scientific notation?

How to turn off scientific notation on CASIO fx-115ES?

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Hello,
Press [SHIFT][MODE][6:Fix] (number between 0 an 9) to select the number of decimal digits you want. Then press [=].
Hope it helps.

Posted on Oct 09, 2009

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