1. lesson 9.2 I CAN . . . -draw and label a three point graph.
-graph a parabola using a table.
-find the roots of a parabola from a graph.
lesson 9.2

2. Example #1: solutions roots zeroes x-intercepts true
What is a three point graph? Draw and label each of the important three points of the graph.
Thinky stuff:
The answers to a quadratic equation (parabola) are called:
___________________
They are numbers that make the answer to the equation __________!
solutions
solutions
roots
zeroes
x-intercepts
vertex
true

3. Example #2:
For each quadratic graphed below, tell how many roots it has and what the roots are. 2 1
How many roots? ______ How many roots? ______ How many roots? ______
Roots: _______________ Roots: ________________ Roots: ________________
{-3, 1}
{4}

4. Graph each quadratic equation below using the vertex and the roots.
Example #3:
Graph each quadratic equation below using the vertex and the roots.
a) Two roots: {–6, 2} b) Two roots: {0, 5}
Vertex: (–2, 6.5) Vertex: (2.5, –2)

5. Example #4:
Graph each quadratic equation by creating a table. Label all the parts of the parabola. a) x y –2 –1 1 2 –5 –8 –9 –8 –5

6. Example #4:
Graph each quadratic equation by creating a table. Label all the parts of the parabola. b) x y –2 –1 1 2 –5 –8 –5

7. Today’s assignment
9.2 Worksheet