Solve each equation using a graphing calculator. [Hint: Begin with the window [-10, 10] by [-10, 10] or another of your choice (see Useful Hint in Graphing Calculator Terminology following the Preface) and use ZERO, SOLVE, or TRACE and ZOOM IN.] (In Exercises 61 and 62, round answers to two decimal places.)
x 2 - x - 20 = 0
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