College Algebra & Trigonometry, 2018a

34 CHAPTER 1. ALGEBRA REVIEW
PROGRAM: Name (whatever name you’ve chosen should show here)
:Prompt A, B, C
On the next line of the program, we will take the values of A, B and C and use
them to calculate the values of the roots of the equation. Type in the following:
PROGRAM: Name
:Prompt A, B, C
:(−B + √ (B 2 − 4AC))/(2A) → R
:(−B − √ (B 2 − 4AC))/(2A) → S
In typing these two lines it’s important that when you type −B, you use the negative
key next to the decimal point, rather than the subtraction key. The calculator
is very picky about this. When you’re typing the B 2 − 4AC, you’ll need to use the
subtraction key on the far right of the keypad.
Also notice the double parentheses - one set for the numerator of the fraction
and one set for the square root. If you don’t type this in correctly it will produce
wrong answers. The arrow in the formula stores the values of the answer in the
variables R and S, and the arrow is produced by the ”sto→” key just above the
ON button in the lower left of the keyboard.
Now that we’ve given the calculator the values for A, B and C and then had
the calculator find the roots of the eqatiuon, we need to display the answers. If
you press the prgm key and arrow over to the I/O menu again, you can choose
3:Disp. This will Display the answers that we’ve stored as R and S.
PROGRAM: Name
:Prompt A, B, C
:(−B + √ B 2 − 4AC))/(2A) → R
:(−B − √ B 2 − 4AC))/(2A) → S
:Disp R,S
Now we can test the program with some simple equations. To run the program,
press the program key and choose the program you’ve created either by selecting
it and pressing enter, or by pressing the number for the program in the list. This
should bring you back to the calculation screen, where you can run the program
by pressing enter. The calculator should then ask you for the values of A, B and
C.