HP 35s Scientific Entering and Evaluating Equations, Entering and Evaluating Equations

6

Entering and Evaluating Equations

How You Can Use Equations

You can use equations on the HP 35s in several ways:

For specifying an equation to evaluate (this chapter).

For specifying an equation to solve for unknown values (chapter 7).

For specifying a function to integrate (chapter 8).

Example: Calculating with an Equation.

Suppose you frequently need to determine the volume of a straight section of pipe. The equation is

V = .25 π d2 l

where d is the inside diameter of the pipe, and l is its length.

￿You could key in the calculation over and over; for example, calculates the volume of 16 inches of 2 1/2–inch diameter pipe (78.5398 cubic inches). However, by storing the equation, you get the HP 35s to "remember" the relationship between diameter, length, and volume — so you can use it many times.

Put the calculator in Equation mode and type in the equation using the following keystrokes:

Entering and Evaluating Equations 6-1