Question

http://prntscr.com/3asxwt

Answer 1

Solve: eq1

Since this equation is set equal to zero, the roots will be the locations where the graph crosses the x-axis (if the roots are real numbers).
(Remember that the x-axis is really just y = 0.)
1. Set eq2
2. Use the ZERO command to find the roots -- 2nd TRACE (CALC), #2 zero
3. Left bound? Move the spider as close to the root (where the graph crosses the x-axis) as possible. Hit the left arrow to move to the "left" of the root. Hit ENTER. A "marker" ► will be set to the left of the root.
4. Right bound? Move the spider as close to the root (where the graph crosses the x-axis) as possible. Hit the right arrow to move to the "right" of the root. Hit ENTER. A "marker" ◄ will be set to the right of the root.
5. Guess? Just hit ENTER.
6. Repeat the entire process to find the second root (which in this case happens to be x = 7).

Answer: one of the roots is x = -2

Answer 2

medal

Answer 3

so its zero :)