How to Program the Quadratic Formula into a CASIO fx‐9750GII

Last Updated: September 16, 2021

If you're using a Casio fx-9750GII regularly, you probably know that it can do a lot of the legwork for you when you need to use the quadratic formula. If you program the formula into the calculator, you'll be able to use it to find your solutions quickly and easily.

Part 1

Part 1 of 2:

Programming the Formula

1
Turn your calculator on and go to the "PRGM" on the menu screen.
- You can also push "9".
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3
Type in the following:
- "Given Ax²+Bx+C=0"
- Push Enter. A small arrow should pop up and you will be on a new line.
4
Type the following:
- "A"?→A
- In order to get the question mark, push the yellow "SHIFT" button then the "VARS" button. This will actually take you to "PRGM". Push "F4" under "?" to type a "?"
- To type an arrow, push the arrow button on your calculator. It is just above the "AC/ON" button.
- Push Enter.
5
Repeat the previous step, except use "B" and "C".
- "B"?→B
- "C"?→C
6
On a new line, type the following:
- "Discriminant D="
- Push Enter
7
Type the following:
- ((B)²-4xAxC)→D◢
- To get the "◢" symbol, push "SHIFT" then "VARS", and then "F5" under the symbol.
- Push Enter
8
Write the If statement. To get the statements, push "SHIFT", "VARS", then "F1" underneath "COM".
- If (D<0)
- Push Enter
- Then "D<0. No real roots. Imaginary roots:"
- Enter
9
Continue writing:
- (-B - √D)÷2A→X
- Enter
- (-B + √D)÷2A→Y
- Enter
- X◢
- Enter
- Y◢
- Enter
10
Type the exit message:
- "-----------------" (Recommended length: 17)
- Enter
- "Hit enter to exit."
- Enter
11
Continue writing. Make sure to use the "Else" from the "COM" section mentioned earlier.
- Else
- Enter
- "Two roots are:"
- Enter
- (-B - √D)÷2A→X
- Enter
- (-B + √D)÷2A→Y
- Enter
- X◢
- Enter
- Y◢
- Enter
12
Finish it off:
- "-----------------"
- Enter
- "Hit enter to exit."
- Enter
- IfEnd
13
Your code should look like this:
- "Given Ax²+Bx+C=0"↵
- "A"?→A↵
- "B"?→B↵
- "C"?→C↵
- "Discriminant D="↵
- ((B)² - 4AC)→D◢
- ↵
- If (D<0)↵
- Then "D<0. No real roots. Imaginary roots:"↵
- (-B - √D)÷2A→X↵
- (-B + √D)÷2A→Y↵
- X◢
- ↵
- Y◢
- "-----------------"↵
- "Hit enter to exit ."↵
- Else ↵
- "Two roots are:"↵
- (-B - √D)÷2A→X↵
- (-B + √D)÷2A→Y↵
- X◢
- ↵
- Y◢
- "-----------------"↵
- "Hit enter to exit ."↵
- IfEnd
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Part 2

Part 2 of 2:

Using the Program

1
When you finish your program, push "EXIT" to leave the coding area. Then, push "F1" or "EXE" to run the program. The screen should show the following:
- Given Ax²+Bx+C=0
- A?
- ~Input a value for A and push enter. Repeat for B and C
2
Try testing out some equations:
- x² - 2x +1
- x² - 4 (In this case, b is 0)
- 4x² + 12x + 5
3
Check your answers. You should get the following answers, respectively:
- 1, 1
- -2, 2
- -2.5, -0.5
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Question

How do I write (:) in a calculator?

Community Answer

If you open the screen to the program, you should see a "char bot" on the bottom right of the screen. Click F6 and then F2 and it should be there.

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Question

How do I type discriminant and given?

Community Answer

First press Shift, then you can A-lock the Alpha key. When it's locked, you can use all the red letters above the keys to type given and discriminant.

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Question

How would I do step 10, typing the exit message?

Community Answer

Click SHIFT, then click on VARS (resulting in PRGM). Click F1 for COM, and you'll see four actions, three of which you have used up to that point. You'll be using the last and fourth one, I-END, and you just have to click F4 now.

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Tips

To write letters, push the red "ALPHA" key. You can lock this key by pushing "SHIFT" then "ALPHA". Push "ALPHA" again to unlock.

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To switch between upper and lower case letters, push "F5" under the "A⇿a" tab.

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Warnings

Do not use the special characters to type "→" or "?".

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Do not type out the "If" statements!

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Make sure your calculator is in imaginary mode. To do this, push "MENU", "1", "SHIFT", "MENU", the go down to "Complex Mode: Real". Push "F2" to select "a+bi".

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How to Program the Quadratic Formula into a CASIO fx‐9750GII

Steps

Programming the Formula

Using the Program

Community Q&A

Tips

Warnings

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