Texas Instruments TI-84 PLUS SILV Guidebook - Page 122
Tables, Getting Started: Roots of a Function
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Chapter 7: Tables Getting Started: Roots of a Function Getting Started is a fast-paced introduction. Read the chapter for details. Evaluate the function Y = X3 N 2X at each integer between L10 and 10. How many sign changes occur, and at what X values? 1. Press z to set Func graphing mode. 2. Press o. Press „ 3 to select 3. Then press ¹ 2 „ to enter the function Y1=X3N2X. 3. Press y - to display the TABLE SETUP screen. Press Ì 10 Í to set TblStart=L10. Press 1 Í to set @Tbl=1. Press Í to select Indpnt: Auto (automatically generated independent values). Press † Í to select Depend: Auto (automatically generated dependent values). 4. Press y 0 to display the table screen. Note: The message on the entry line, "Press + for @Tbl" is a reminder that you can change @Tbl from this table view. The entry line is cleared when you press any key. 5. Press † until you see the sign changes in the value of Y1. How many sign changes occur, and at what X values? In this case, you can also see the roots of the function by finding when Y1=0. You can explore changes in X by pressing à to display the @TTbl prompt, entering a new value, and searching for your answer. Chapter 7: Tables 115