Day 15: Quadratics

1.

Which ordered pair represents one of the roots of the function f(x) = 2x2 + 3x − 20?

F (− 5/2 , 0) H (−5, 0)G (−4, 0) J (−20, 0)

2.

The graph of y = x2 + 2x − 8 is shown

below.Which coordinate pair

best represents the vertex of this graph?

 F (−4, 0)G (2, 0)H (0, −8)J (−1, −9)

3.

What is the x intercept of 3x + 12y = 21?

4.

The completion of a certain chemical reaction is expressed by the equation y = 250 − 5x − x2, where y is the number of seconds needed to complete the reaction and x is the temperature in degrees Celsius at which the reaction occurs. If the reaction is complete in 200 seconds, what is the temperature at which the reaction occurs?

A 5°CB 7°CC 10°CD 12°C

5.

What is the parent function of y = 7x – 18?

6.

What are the zeros of the function y = 1/2 (x + 4)(x − 6)?

A −4 and 6 C 4 and −6 B −3 and 2 D −2 and 3

7.

What is the solution set for the equation 2x2 − 16x − 96 = 0?

A {4, 12} C {−4, −12} B {−4, 12} D {4, −12}

8.

What is the slope of 15y + 5x = 120?

Hint: If you get -3 you are wrong!

9.

10.

Simplify (2x + 1) (3x – 4)

11.

The graph below shows the height of a baseball from the time it is thrown from the top of a building to the time it hits the ground.

How much time elapses while the baseball is 80 meters or more above the ground?

F 1 sec G 9 sec H 7 sec J 6 sec

12.

Which of the below simplifies 3( x + 2) - 3( 2x – 1)?

a. -3x + 3b. -3x + 9c. 3x2 + 6x – 12d. 3x2 – 3x + 12

13.

Which of the following polynomial equations best represents this graph?

 A (x + 6)(x − 2) = yB (x − 2)(x − 16) =

yC (x − 6)(x + 2) = yD (x + 2)(x + 16) =

y