HP 35s HP 35s scientific calculator - User Guide - Page 113

Type of Equation Result for  Result for  Equality: g(x) = f(x) Example: x2 + y2 = r2 g(x) - f(x) x2 + y2- r2 Assignment: y = f(x) Example: A = 0.5 × b x h f(x) 0.5 × b × h y - f(x) A - 0.5 × b × h Expression: f(x) Example: x3 + 1 f(x) x3 + 1 Also stores the result in the left-hand variable, A for example. To evaluate an equation: 1. Display the desired equation. (See "Displaying and Selecting Equations" above.) 2. Press  or . The equation prompts for a value for each variable needed. (If the base of a number in the equation is different from the current base, the calculator automatically changes the result to the current base.) 3. For each prompt, enter the desired value: If the displayed value is good, press . If you want a different value, type the value and press . (Also see "Responding to Equation Prompts" later in this chapter.) To halt a calculation, press  or . The message is shown in line 2. The evaluation of an equation takes no values from the stack - it uses only numbers in the equation and variable values. The value of the equation is returned to the X- register. Using ENTER for Evaluation If an equation is displayed in the equation list, you can press  to evaluate the equation. (If you're in the process of typing the equation, pressing  only ends the equation - it doesn't evaluate it.) Entering and Evaluating Equations 6-11