Parabolas: Vertex, axis of symmetry, & y-intercepts

Which letter determines if a parabola opens up or down y=ax²+ bx + c?

• a

• b

• c

What is the axis of symmetry?

• the slope of the graph
• the dividing line for a parabola
• a way to spin my pencil
• the x-axis

A parabola has a vertex at (-3,2).
Where is the axis of symmetry?

• y = -2
• x = 3
• x = -3
• y = 2

Which of the following equations matches standard form of a quadratic?

• ax + by = c
• y = a(x - h)² + k
• y = ax² + bx + c
• y = mx + b

Find the axis of symmetry for
f(x) = x²- 8x + 15.

• x = -4
• x = 4
• y = 4
• y = -4

Find the vertex of 
f(x) = -x² - 4x + 12.

• (-2, 16)
• (2, 0)
• (2, 4)
• (-2, 4)

Given y=2(x+3)(x-7), find the vertex.

• (2, -50)
• (10, 50)
• (-2, -18)
• (4, -42)

Which best describes the vertex of a parabola?

• Any point on the parabola.
• A point on the x-axis.
• The highest or lowest point of a parabola
• A point on the y-axis.

How many roots does this parabola have? 

• 3
• 2
• 0
• 1

Is this a max or min?

• max
• min