11.2 Intro to Quadratics

Find the vertex of the following quadratic equation:

y = 2x² -16x + 33

• (-4, 129)

• (4, 1)

• (0, 0)

• (2,9)

Find the vertex of the following quadratic equation:

y = -x² +2x + 1

• (1, 2)

• (-1, -2)

• (-1, 3)

• (0, 0)

Find the vertex of the following quadratic equation:

y = 3x²

• (0, 3)

• (-3, 0)

• (0, -3)

• (0, 0)

What is the formula above primarily used for?

• Finding the axis of symmetry from standard form
• Finding the vertex from standard form
• Finding the vertex from vertex form
• Finding the vertex from standard form

What is the vertex of f(x) = x² + 4x + 3?

• (2,1)
• (-2,1)
• (0,0)
• (-2,-1)

• (0, 0)

• Not enough info

• (5, -13)

• (-13, 5)

• not enough info

• (-9, 4)

• (-4, -9)

• (4, 9)

Define Vertex

• Where the parabola touches or intersects the x-axis

• The highest or lowest point on the graph where the parabola changes directions

• Where parabola line touches or intersects the x- axis, also called the x-intercept

• A line that divides the graph into two equal parts. i.e. cuts the graph in half

Define Axis Of Symmetry

• A line that divides the graph into two equal parts. i.e. cuts the graph in half

• Where the parabola touches or intersects the x-axis, also called the x-intercept

• The highest y-value on the graph

• The highest or lowest point on the graph

What is the "formula" for finding the axis of symmetry?