HP 35s HP 35s scientific calculator - User Guide - Page 108
Parentheses in Equations, Displaying and Selecting Equations
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Parentheses in Equations You can include parentheses in equations to control the order in which operations are performed. Press 4 to insert parentheses. (For more information, see "Operator Precedence" later in this chapter.) Example: Entering an Equation. Enter the equation r = 2 × c ×(t - a)+25 Keys: Display: 4 Description: Shows the last equation used in the equation list. Starts a new equation with variable R. Enters a number Enters infix operators. Enters a prefix function with a left parenthesis. Enters the argument and right parenthesis. Terminates the equation and displays it. Shows its checksum and length. Leaves Equation mode. Displaying and Selecting Equations The equation list contains two built-in equations, 2*2 lin. solve and 3*3 lin. Solve, and the equations you've entered. You can display the equations and select one to work with. 6-6 Entering and Evaluating Equations