1. Ch. 6.1: Solve Quadratic Equations by Graphing

2. Using the TI-Calculator
Solve for y, then press ‘y=‘ key. Enter the equation.
Press ‘Graph’ key (if can’t see graph, try hitting ‘Zoom’ and ‘Standard’)
The answer(s):
Where does the graph hit the x-axis?
Hit 2nd-Trace, then 2-Zero
The screen asks ‘Left bound?’. Use arrow keys to move the cursor to the left of one of the x-intercepts. Press ‘Enter’.
The screen asks ‘Right bound?’. Use arrow keys to move the cursor to the right of that x-intercept. Press ‘Enter’. Then press ‘Enter’ again to ‘Guess’ the zero.
Repeat this process to find the other zero.

3. ****You can have 2, 1, or 0 answers!****
Vertex: minimum/maximum point of the graph
Press 2nd-Trace, then 3-(Minimum) for upward opening, 4-(maximum) for downward opening
Again, follow previous slide’s directions for answering left bound and right bound questions.
Axis of Symmetry: Cuts Parabola in half
“x = “ x-value from vertex

4. Example: Parts to Know **Solutions, Zeros, Roots, and X-intercept all
Solution: x= -2, x = 1
Vertex: (- 0.5, 2.25)
Axis of symmetry: x = - 0.5
**Solutions, Zeros, Roots, and X-intercept all
mean the same thing, find the value(s) of x!**

5. YOU TRY! Example:
Parts to Know
Roots:
Vertex:
Axis of symmetry:

6. Example: Parts to Know Roots: x= -3 Vertex: (- 3, 0)
Axis of symmetry: x = - 3