Quadratic Formula Program for the TI-82 / TI-83

If you are using a TI-82, you begin to enter a program by going to the program menu
(PRGM) and selecting NEW.

In the code below, the first time that a command is used, its location in [Menu,
(submenu), item] is given.

Hint: To type a letter, you must be in ALPHA mode. Press ALPHA a few times to see
what the ALPHA cursor looks like . If you are typing several letters, you may want to
choose A-LOCK (alpha-lock).

	TI-83
NAME: QUAD
: Prompt A,B,C	[PRGM, I/O, 2]
: B^2-4AC->D	[STO->]
: Disp "DISCRIMINANT"	[PRGM, I/O, 3]
: Disp D
: Pause	[PRGM, CTL, 8]
: If D<0	[PRGM, CTL, 1] [TEST, 5]
: Goto 1	[PRGM, CTL, 0]
: Disp " SOLUTIONS "
: Disp (-B+)/(2A)
: Disp (-B-)/(2A)
: Goto 2
: Lbl 1	[PRGM, CTL, 9]
: Disp "Domain Error"
: Lbl 2

When you are finished entering the program, press quit . To run the program, go to the
program menu, select EXEC, select the program QUAD, and press enter .

Test your program with quadratic equations where you know the correct solutions . The
program will display the discriminant first. Press enter to continue. If you get an error
message, check the code entered to the code shown above.