Radio Shack TRS-80 PC-3 Owner's Manual page 240

KEY OPERATION SEQUENCE
Step No. Key Input Display Remarks
1
@)CKJ
STARTING POINT =_ Waiting for starting point input
2
0
(ENTER)
MINUTE INTERVAL =_ Waiting for minute interval input
3 0.0001 (ENTER) INTERVAL= _
Waiting for interval width input
4 0.5
(ENTER)
ANSWER = 2. Display of roots
5 (ENTER) ANSWER = 1.
By repeatedly pressing the (ENTER)
key, the roots
of the function are found.
6
(ENTER)
ANSWER =
-1.
7
(ENTER)
ANSWER = 1.
8
(ENTER)
ANSWER =
-1.
9
(ENTER)
ANSWER = -1.
10
(ENTER)
ANSWER = -1.
11
(ENTER)
ANSWER = 2.
74!>