Solve each equation using a graphing calculator. [Hint: Begin with the window [210, 10] by [210, 10] or another of your choice (see Useful Hint in the Graphing Calculator Basics appendix, page A2) and use ZERO 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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