Keystone Test Keystone Algebra: Polynomials and Quadratic Functions 3

Question 1

What is the y-intercept of the quadratic y = 3x² − 4x + 7?

Accepted Answer

7

Answer

3

Answer

−4

Answer

0

Question 2

Which expression is equivalent to (x + 5)²?

Accepted Answer

x² + 10x + 25

Answer

x² + 25

Answer

x² + 5x + 25

Answer

x² − 10x + 25

Question 3

How many real solutions does x² + 4 = 0 have?

Accepted Answer

None

Answer

One

Answer

Two

Answer

Four

Question 4

What is the sum of the polynomials (3x² + 2x) and (x² − 5x + 4)?

Accepted Answer

4x² − 3x + 4

Answer

4x² + 7x + 4

Answer

2x² − 3x + 4

Answer

4x² − 3x

Question 5

A ball is thrown upward and its height is h = −16t² + 64t. At what time does it reach maximum height?

Accepted Answer

t = 2 seconds

Answer

t = 4 seconds

Answer

t = 1 second

Answer

t = 8 seconds

Question 6

Which is the correct factored form of x² − 16?

Accepted Answer

(x − 4)(x + 4)

Answer

(x − 4)²

Answer

(x + 4)²

Answer

(x − 8)(x + 2)