Solve: 
Since this equation is set equal to zero,
the zeros (roots) will be the locations where
the graph crosses the x-axis (if the roots are real numbers).
1. Set 
2. Use the ZERO command to find the
zeros (roots) -- 2nd TRACE (CALC), #2 zero
3. Left bound? Move the spider
as close to the zero (root --- where the graph crosses the x-axis)
as possible. Hit the left arrow to move to the "left" of the zero
(root). Hit ENTER. A "marker"
► will be set to the left of the
zero (root).
4. Right bound? Move the spider as
close to the zero (root --- where the graph crosses the x-axis)
as possible. Hit the right arrow to move to the "right" of the zero
(root). Hit ENTER. A "marker"
◄ will be set to the right of
the zero (root).
5. Guess? Just hit
ENTER.
6. Repeat the entire process to find other zeros (roots --- which
in this case the second root happens to be x = 7).
Answer: one of the
zeros (roots) is x = -2
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