1. Before: March 16, 2018 3. y = x² + 4x + 5 4. y = 3x² + 2
Find the axis of symmetry.
y = x² - 3x + 1
y = -2x² + 4x + 3
Find the vertex.
3. y = x² + 4x + 5
4. y = 3x² + 2
Before: March 16, 2018

2. During: Graphing Quadratic Functions

3. Recall that a y-intercept is the y-coordinate of the point where a graph intersects the y-axis. For a quadratic function written in the form y = ax² + bx + c, when x = 0 the y-intercept of a quadratic function is c.

5. Graphing a Quadratic Function
Step 1: Find the axis of symmetry. Graph!
Step 2: Find the vertex. Graph!
Step 3: Find the y-intercept. Graph!
Step 4: Find another point on the same side of the axis of symmetry as the point containing the y-intercept. Graph!
Step 5: Reflect the points across the axis of symmetry. Connect the points with a smooth curve.

6. “I Do” Graphing a Quadratic Function
y = x² - 4x - 5
“I Do” Graphing a Quadratic Function

7. “I Do” Graphing a Quadratic Function
y = 3x² - 6x + 1
“I Do” Graphing a Quadratic Function

8. “We Do” Graphing a Quadratic Function
y = x² - 6x + 9
“We Do” Graphing a Quadratic Function

9. “We Do” Graphing a Quadratic Function
y = -2x² - 8x + 4
“We Do” Graphing a Quadratic Function

10. “We Do” Graphing a Quadratic Function
y = -x² + 2x
“We Do” Graphing a Quadratic Function

11. “You Do” Graphing a Quadratic Function
y = 3x² + 12x + 9
“You Do” Graphing a Quadratic Function