Quadratic Functions

What do we call the graph of a quadratic function?

• parabola

• linear

• cubic

• sinusoidal

How do you express a quadratic equation?

• a + b

• 2a

• ax² + bx + c = 0

• a = 4

Find the roots of the equation: x²+3x-10

• 1,9

• 5,-2

• 3,-8

• -5,2

How many zeros does this parabola have? 

• 3

• 2

• 0

• 1

If a toy rocket is launched vertically upward from ground level with an initial velocity of 128 feet per second, then its height h after t seconds is given by the equation
h(t) = -16t² +128t  
When will the object reach its maximum height?

• 4 ft

• 0 seconds

• 0 ft

• 4 seconds

What is the y intercept for the equation:
y = -8x² + 3x - 7

• (0, -8)

• (0, 3)

• (0, 7)

• (0, -7)

What should you do first to solve this equation using quadratic formula?

• Get factored form

• Write down: a=1, b=6, c=-13

• Make it equal 0 by subtracting 3 on each side

• Type it all in a calculator.

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

• up

• down

• Neither; it opens to the right.

• Neither; it opens to the left.

What are the zeros of the parabola? 

• 1, 5

• 3, -5 

• 3, 0

• -6, 1

The height of a water balloon that is launched into the air is given by h(t) = -5x²+20x+25. When will the balloon explode on the ground?

• 5 seconds

• 1 second

• 2 seconds

• 3 seconds