You can easily solve equations using the Casio graphing calculator. The key decision for the user is whether to work in the real or the complex number system. For example, let’s solve the quadratic equation, 2x2 - 5x + 12 = 0.
Press MENU 9 to access the CAS screen. To solve the equation in the real number system, press CTRL SETUP to access the set up menu, highlight Answer Type:, then press F1 to set the answer type to Real. After the set up options are made, press EXE to return to the CAS screen. Press F1 to access the TRNS menu, then press 4 to select 4:solve. Enter the equation, then press , (comma) X ) EXE. The equal sign is located above the decimal point key. The Casio responds with No Solution, indicating that this quadratic equation has no real roots.
To obtain the complex roots, press CTRL SETUP to access the set up menu, highlight Answer Type:, press F2 to set the answer type to CPlX (complex mode), then press EXE. The complex roots are