Casio fx 115 ES - Square and Nth Roots

How to simplify radicals using the Casio

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Howto & Style

Tags:

• rstallworth12
• casio
• square roots
• radicals

[CharlieBoysMommy]

I was not sucessful with the radical mulitiplication problem I posted, can you help, again? ty

[rstallworth12]

Hello @CharlieBoysMommy, as I stated below, the Casio does not perform operations on variable terms (such as adding, subtracting, multiply or dividing terms that contain variables). Here is how you can tell when you can use the Casio.  If the original problem has an equal sign with terms on (each side) of the equal sign, you can use the Casio. If it's just an operation between two or more terms (as what you have above) you cannot.

[CharlieBoysMommy]

index 3 sqrt 9 (times) index 3 sqrt 6 = ?

[CharlieBoysMommy]

Thanks! Yes, it works - I got X=9, also. I am now going to attempt this multiplication problem using some of these steps: index 3 sqrt 9 x index 3 sqrt 6=

[rstallworth12]

Note of Caution: Some of the more complicated radical equations can have more that one solution. To my knowledge, the Casio only generates one of them.

[rstallworth12]

6) You should see "Solve for X" in the window, hit the "=" sign at the bottom right corner of calculator.

7) You should see, X = 9 on the second line of the screen.

Let me know if the steps don't work out.

[rstallworth12]

1) Hit the square root key

2) Enter the expression 3X - 2 (you can access the variable "X" by selecting the "ALPHA" button then the " ) " button).

3) Move the cursor from under the radical sign, by hitting the right arrow on the circular navigation wheel.

4) Now select the (red) equal sign by selecting "ALPHA" then "CALC", then enter "5"

5) To solve it, hit "SHIFT", then "CALC"

[rstallworth12]

Hello @CharlieBoysMommy , to my knowledge, the Casio does not perform operations on (variable) radical terms. However, it will solve radical equations. For example, if you are trying to solve the equations sqrt(3x - 2) = 5, you could use the Casio to solve it. It will be difficult for me to type out the steps, but I'll try. I will have to use multiple windows to type it all in. I hope you will be able to follow. :-)

[CharlieBoysMommy]

I am looking to see if you have a video that explains solving or adding and multiplying radicals together when they have a variable under the square root sign. Is their a video for this on YouTube? I love your videos! thanks :)