Quadratic Functions

How many zeros does this parabola have? 

• 3

• 2

• 0

• 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

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 are the green dots called?

• axis of symmetry

• vertex

• parabola

• roots or x-intercepts

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

x² + 6x - 13 = 3

• 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 this function have a maximum or minimum?

• maximum

• minimum

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

What are the solutions to this equation? (x-3)(x+2)=0

• 3 and -2

• -3 and 2

• 2 and -6

• 3 and 2

ax²+bx+c=0  is the standard form of a quadratic equation.

• True

• False