HP HP-67

Subroutines 203
Press Display
10
18
6
o
Calculates
the
first
root,
I;.
a8
Calculates
the
second
root, rp.
30
20
1
o Calculates r,.
a Calculates r».
If the quantity b? — 4ac is a negative number, the calculator will dis-
play and the running program will stop. For a more
efficient and accurate method of finding the roots of a quadratic equa-
tion, see the Polynominal Evaluation program in your HP-67
Standard Pac.
Note: When loading instructions into the calculator in
W/PRGM mode, you can load an {7 (G55 B throughB or
EY o] (& through (&) instruction by simply pressing
the appropriate user-definable key(s). For example, to load
the instruction [2 3, you can simply press [ ; the
keycode for [ (G55 ¥, 31 22 11, will appear in the display.
For clarity and ease of reference, however, the complete
keystroke sequence is always shown in this handbook.