Question about Casio FX-115ES Scientific Calculator

# How you find the cube root of a complex number (8,60degrees) on the Casio Fx-115ES

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• Casio Master

You can use the root functions even in COMPLEX Mode, but you cannot feed the root functions a number that is complex.

The case you have given is easy enough to do by hand (see screen capture below.)

Posted on May 23, 2011

• k24674 May 23, 2011

Result is (2, pi/9) with angle in radians or (2, 20 degrees).

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Posted on Jan 02, 2017

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## Related Questions:

### Is fx 115ES supports matrix with complex numbers as elements..if not please suggest one...

The calculator barely handles matrices of up to 3X3. Matrices with complex coefficients are well beyond its capabilities.

Oct 13, 2013 | Casio FX-115ES Scientific Calculator

### I have a casio fx-115ES and I want to do a cube root without answering in decimal forms

Sorry, but the fx-115ES can only display square roots in radical form. Cube roots are beyond its symbolic capabilities and will always be in decimal form.

Mar 08, 2013 | Texas Instruments TI-86 Calculator

### How to find cube root

Use the cube-root function, which is the shifted function of the square-root key (third row, second column). For example, to find the cube root of 8, press
SHIFT [cube-root] 8 =

Jul 09, 2011 | Casio FX-115ES Scientific Calculator

### I can't plug in "i" on my casio fx-115ES even when

By default the calculator only works with real numbers. To use complex numbers, press MODE 2 to switch to complex mode.

Dec 13, 2010 | Casio FX-115ES Scientific Calculator

### How does a cube root sign appear in calculator??

There is no cube root key on the fx-115ES. There is a general root function. It's the shifted function of the x^ key, just below and to the right of the big round key at the top of the keyboard, above the sin key. To find the cube root of 8:

In LineIO mode: press 3 SHIFT [root] 8 =

In MathIO mode: press SHIFT [root] 3 right-arrow 8 =

Dec 09, 2010 | Casio FX-115ES Scientific Calculator

### How do i find square root of a number on casio FX-115ES?

Press the square-root key (third row from the top, second column from the left). Type in the number and press =. If you get a symbolic result, press S-D to convert or else press SHIFT ENTER instead of ENTER. If you don't want to see any symbolic results, press SHIFT MODE 2 to switch to the LineIO mode.

Dec 05, 2010 | Casio FX-115ES Scientific Calculator

### How would I use this calculator to find a square root?

Two buttons under the shift key-(top left key) and to the right one is the square root key. Just push it and put the number in...it is not manditory to close the parentesis. You can also hit shift before the square root key to get the cubed root.

Apr 20, 2010 | Casio FX-115ES Scientific Calculator

### How do i do a number 'to the power of 1/2 or 2/3? cheers Brad

Power 1/2 is the same as square root: You can use the square root key to the left of the square key.
Similarly power 1/3 is the cube root. You use the [SHIFT][Square root] key sequence.
Power 2/3 is the square of the cube root, or the cube root of the square.

More generally, you can use the universal power key, marked with X with a raised white rectangle. It is between X square and log.

Ex: Calculate 15^(2/3)
15 [X with raised rectangle] 2 [/] 3 [)] [=]; the result is 6.082
The last parenthesis closes the left parenthesis introduced by the calculator.
Alternatively you can use the cube root and the x-root selections available under the MATH menu.(selections 4 and 5)

Mar 14, 2010 | Casio FX-115ES Scientific Calculator

### Using my Casio FX-115ES

Use the key that is 3 keys below the ALPHA button. You must press that key, then place the number or equation you are trying to get the square root of.

Apr 13, 2009 | Casio FX-115ES Scientific Calculator

### To work out the cube root of a number

I am guessing, but, find the key that has a 3 to the left of the root symbol, looks like a check mark. Push it, then the number you want to take a cube root of, then enter.

Jan 08, 2009 | Casio FX-115ES Scientific Calculator

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