HP 35s Scientific Calculator - Manual (Page 208)

13-26 Simple Programming
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 4 + Bx 3 + Cx 2 + 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.