Texas Instruments TI-84 PLUS SILV Guidebook - Page 303
Activities, The Quadratic Formula
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Chapter 17: Activities The Quadratic Formula Note: This example uses MathPrint™ mode for real answers and Classic mode for non-real (complex) results. You can also use the Polynomial Root Finder/Simultaneous Equation Solver application to solve these types of problems with a quick set-up. This application comes preloaded on your TI-84 Plus and can be downloaded from education.ti.com. Use the quadratic formula to solve the quadratic equations 2x2 N 11x + 14 = 0 and 2x2 N 6x + 5 = 0. Graphing the Functions Before you begin, look at the graphs of the functions to see the approximate locations of the solutions. 1. Press o to display the Y= editor. 2. Press 2 „ ¡ ¹ 11 „ Ã 14 for Y1, and then press Í. 3. Press 2 „ ¡ ¹ 6 „ Ã 5 for Y2. 4. Press q and select 4:ZDecimal. The graph of the functions displays. You can see that the graph of the first function, 2x2 N 11x + 14 = 0, crosses the x-axis, so it has a real solution. The graph of the second function does not cross the x-axis, so it has a complex solution. Chapter 17: Activities 296