Intro to Parabolas

Does the equation open up or down? 
Y = -3x² +7x - 2

• up

• down

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

Which of the following is the vertex of the graph?

• (2, 0)

• (-2, 0)

• (0, 4)

• (-1, 3)

What shape is the graph of a quadratic?

• Hyperbola

• Parabola

• Straight Line

• Circle

What is the axis of symmetry for this graph? 

• x = 2

• x = -4

• y = -4

• there is not one

What direction is the following equation opening?
y=-3x²-7x+8

• Up

• Down

• Left

• Right

Find the vertex of
y = x² + 4x + 1
Use the equation in the picture!

• (0, 0)

• (-2, 13)

• (2, 13)

• (0.375, 6.0625)

Find the vertex of
y = 4x² + 4x + 4
Use the equation in the picture!

• (0, 0)

• (-0.5, 7)

• (0.5, 4)

• (0.375, 6.0625)

Parabolas can open which of the following ways?

• Up

• Down

• Right

• Left

A parabola changes direction at what point?

• Slope

• Y-intercept

• vertex

• x-intercept