Vertex Form

What do we call the graph of a quadratic function?

• parabola
• linear
• cubic
• sinusoidal

What is the vertex of this parabola?

• (−1, 3)
• (−3, 11)
• (−2, 5)
• (0, 5)

What is the y-intercept of this parabola?

• (−1, 3)
• (−3, 11)
• (−2, 5)
• (0, 5)

What are the green dots called?

• axis of symmetry
• vertex
• parabola
• roots or x-intercepts

How can you tell whether a parabola opens up or opens down by looking at the equation?

• The vertex tells you the direction of the opening

• The value of "a" tells you the direction of the opening.

• All parabolas open upward

• All parabolas open downward

Identify the vertex and whether the graph opens up or down.

• (5, 2); opens up

• (-5, 2); opens up

• (5, 2); opens down

• (-5, 2); opens down

What is the vertex of this quadratic?

y = 3(x – 1)² – 27

• (1, –27)

• (–1, –27)

• (1, 27)

• (–1, 27)

What is the vertex of this quadratic?

y = (x + 3)² – 7

• (3, 7)

• (3, –7)

• (–3, –7)

• (–3, 7)

What is the vertex of this quadratic?

y = (x + 4)² – 16

• (4 ,16)

• (4 ,–16)

• (–4, 16)

• (–4, –16)

What is the vertex of this quadratic?

y = (x + 9)² – 1

• (9, 1)

• (–9, –1)

• (9, –1)

• (–9, 1)