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HOW TO EVALUATE A FUNCTION WITH TI89 CALCULATOR

Steps Key Sequence Screens
1. Input Equation into Y1  
2. Quit Equation Editor Press 2nd, then ESC (for QUIT)
3. Evaluate Function for
any x Value (e.g., x = 2.5)
Press: y, then 1, then (2.5)
4. Execute Press ENTER
NOTE: If the calculator returns exact values, then press the 'diamond' key, then ENTER