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Okay, this seemed to work, don't ask me why.
Once you have your graph, select "Math" from the function menus (should be the f1 key after you hit "more"). Then select "Root" (should be f3). Move the cursor to just left of the x-intercept and press enter. It should display the x-intercept (point where y=0) at the bottom of the screen.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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