Quadratics Questions

Find the zeros of this quadratic.

• b=4/5, b=3

• b=4, b=-3

• b=1/5, b=3

• b=4/5, b=-3

A ball is hit into the air with an initial velocity of 100 ft/s. Its height, h, after t seconds is given by the function

h = -16t² + 100t + 5

How many seconds did it take for the ball to reach its maximum height?

• 3.654 seconds

• 2.451 seconds

• 161.25 seconds

• 3.125 seconds

A ball is thrown into the air with an initial velocity of 100 ft/s. Its height, h, after t seconds is given by the function

h = -16t² + 100t + 5.

What is the maximum height?

• 125.251 feet

• 161.25 feet

• 239.126 feet

• 115.25 feet

What are the x- intercepts?

• x= 0 and x= -4

• x= 0 and x= 4

• y= 0

• x= 2

• {4.15, -2.65}

• {5, -3.6}

• {3.6, -5}

• No solution

The height of an object thrown into the air can be modeled by the formula h(t) = -16t² + 70t + 65, where h(t) is in feet after t seconds.

What is the height of the object after 5 seconds?

• 15 feet

• 45 feet

• 70 feet

• 71.56 feet

Solve
2x² + 17x + 21 = 0

• x= ^-21/₂, -17

• x= ²/₃, 16

• x=-7, ^-3/₂

• x=15, -³/₇

What are the x-intercepts?

• x = -8, 2

• x = 8, -2

• x = -8, -2

• x = 8, 2

What is the vertex?

• (-3, -25)

• (-3, -43)

• (3, 11)

• (3, 8)

• A

• B

• C