HP 15c - Manual (Page 228)

228 Appendix D: A Detailed Look at _
Solution: The equation for the shear stress for x between 0 and 10 is more
efficiently programmed after rewriting it using Horner's method:
Q = (3x–45)x
2
+ 350 for 0 < x < 10.
Keystrokes Display
| ¥ 000–
Program mode.
´ b 2 001–42,21, 2
1
002– 1
Test for x range. 0
003– 0
|£ 004– 43 10
t 9 005– 22 9
Branch for x ≥ 10.
| ` 006– 43 35
3
007– 3
* 008– 20
3x.
4
009– 4
5
010– 5
- 011– 30
(3x – 45).
* 012– 20
* 013– 20
(3x – 45)x
2
.
3
014– 3
5
015– 5
0
016– 0
+ 017– 40
(3x – 45)x
2
+ 350.
| n 013– 43 32
End subroutine.
´ b 9 019–42,21, 9
Subroutine for x ≥ 10.
‛ 020– 26
3
021– 3
10
3
=1000.
| n 022– 43 32
End subroutine.
Execute _ using initial estimates of 7 and 14 to start at the outer end
of the beam and search for a point of zero shear stress.