Before: March 16, y = x² + 4x y = 3x² + 2

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Presentation transcript:

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

During: Graphing Quadratic Functions

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.

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.

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

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

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

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

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

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