567:N:d:k2; Figure 8 - HP 20b Instruction Manual

hp calculators
HP 20b Using the RPN stack to solve problems efficiently
Using the stack registers efficiently does not mean to keep track of all stack register contents all the time. Instead
keeping track of what is happening, like which registers have their contents being used, is helpful.
Practice solving problems with stack registers
Example 5: Now what is a short keystroke sequence to find y value if the previous expression is changed for the one
below, given x=3.4567?
Solution: One of the shortest keystroke sequences to compute y in the expression is:
3.4567:n:d:i}:d:k2*++
These examples only begin to scratch the surface of the possibilities that exist when using RPN.
hp calculators
1
= + × −
y x 2 ln( x )
x
- 5 - HP 20b Using the RPN stack to solve problems efficiently - Version 1.0

Figure 8

Figure 9