HP (Hewlett-Packard) 35s ユーザーズマニュアル

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Polynomial Expressions and Horner's Method
Some expressions, such as polynomials, use the same variable several times for their 
solution. For example, the expression
Ax
Bx
Cx
Dx + E
uses the variable x four different times. A program to calculate such an expression 
using RPN operations could repeatedly recall a stored copy of x from a variable. 
Example:
Write a program using RPN operations for 5x
4
 + 2x
3
, then evaluate it for x = 7.