# 20 Most Recent Casio Brand New-Fx-991es Plus - Scientific Calculator Questions & Answers

why cant they include infinity symbol ? sometimes i feel my calculator is so dumb !

Casio Brand... | Answered on Nov 22, 2019

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Casio Brand... | Answered on Nov 28, 2018

To convert a single answer from symbolic to decimal, press the S--D key (just above the DEL key). To have all answers come out in decimal format, press SHIFT MODE 2 to switch to the LineIO mode.

Casio Brand... | Answered on Nov 21, 2018

Write your equations first, then try to use the calculator to solve the problem. If you don't know how to do it by hand, you won't be able to ask the calculator to do it for you.

Casio Brand... | Answered on Apr 08, 2018

If it does not have the FACT key, you must factor by hand: Divide by 2, then by 3, 5, 7 etc.

Casio Brand... | Answered on Apr 08, 2018

I would take it apart and see if they installed the display upside down. I wouldn't think the wires would be long enough to do this, but maybe that is the way it is laid out.

Good luck.

Paul

Casio Brand... | Answered on Sep 17, 2016

I'm having trouble with this one.

If I evaluate 120 x ((1/30)-0.3219281), I get -34.631372.

If I evaluate 120 x ((1/(30-0.3219281), I get 4.043389355.

Any questions, let me know.

Good luck,

Paul

Casio Brand... | Answered on Aug 28, 2016

What you call the iota may be the key to enter imaginary parts of complex numbers. Please read your calculator's manual.

Casio Brand... | Answered on Sep 04, 2015

This is a good scientific calculator that can do a lot, but things in the realm of a CAS (Computer Algebra System) are beyond its capabilities.

Casio Brand... | Answered on Sep 04, 2015

You cannot. It will be of no use to you on this calculator because it cannot do algebra.

Casio Brand... | Answered on Nov 11, 2014

One foot is exactly 0.3048 meters, so one meter is about 3.28 feet.

Casio Brand... | Answered on Oct 01, 2014

It only calculates the FIRST derivative of a function that is defined by a formula. The derivative is calculated at a point that must be given.

Casio Brand... | Answered on Sep 19, 2014

### Brand New-Fx-991es Plus - Scientific Calculator Manual

Casio Brand New-Fx-991es Plus -... | Uploaded on Sep 11, 2014

Use the EQN mode. Select the type of equation, and type in the coefficients. Then solve. It is not sure you will find it again after you turn off calculator.

Casio Brand... | Answered on Aug 30, 2014

Press [SHIFT][ division key]. It is marked with nCr.

Casio Brand... | Answered on Aug 27, 2014

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