Quadratic Review

An function written in the form f(x)=ax²+bx+c, a≠0 is 

• linear

• quadratic

• cubic

• absolute value

Factor the expression 4x²-21x-18

• (x+6)(4x-3)

• (4x-6)(x-3)

• (x-6)(4x-3)

• (4x+3)(x-6)

Use the quadratic formula to solve         3x²+2x-4=0

• {1.54, 0.87}

• {1.54, -0.87}

• {-1.54, 0.87}

• no solution

A brick falls from the top of a building.  The equation h=-16t² - 21t + 200 represents the height of the brick h in feet after t seconds.  How long will it take the brick to reach the ground? Round your answer to the nearest tenth as needed.)

• 2.8

• 2.9

• 3.0

Solve the equation by finding the square roots.  a²=64

• 8

• -8

• ±8

What is the equation for axis of symmetry?

• y=3

• x=3

• x=5

• x=1

How many roots does this parabola have? 

• 3

• 2

• 0

• 1

Solve: x² + 3x - 18 = 0

• x = -3 and x = 6

• x = 3 and x = -6

• x = -9 and x = 2

• x = 9 and x = -2

Based on the table, which function can best be used to model this situation?

• h(t) = 99t² + 858

• h(t) = -4.9t² + 295t + 0.6

• h(t) = -4.9t² + 295t + 2

• h(t) = 99t² + 1,470.3

What is the green dot on the parabola called?

• maximum

• minumum

• roots

• zeros