College Algebra Unit 3 Review

Solve
2x² + 17x + 21 = 0

• x= ^-21/₂, -17
• x= ²/₃, 16
• x=-7, ^-3/₂
• x=15, -³/₇

Find the vertex (maximum or minimum) of 
f(x) = -x² - 4x + 12.

• (-2, 16)
• (2, 0)
• (2, 4)
• (-2, 4)

Suppose that the equation V = 20.8x² – 458.3x + 3,500 represents the value of a car from 1964 to 2002. What year did the car have the least value? (x = 0 in 1964) 

• 1965
• 1970
• 1975
• 1980

What does i² = ?

• -1
• √-1
• 1
• -√1

Tags

CCSS.HSN.CN.A.1

Find the sum.
(5-2i) + (-7+8i)

• -2+6i
• 12+6i
• -35-16i²
• -35 -16i

Tags

CCSS.HSN.CN.A.2

Simplify: 
(10+ 15i) - (48 - 30i)

• 58 - 45i
• 58 - 15i
• -38 - 15i
• -38 + 45i

Tags

CCSS.HSN.CN.A.2

Simplify: 
(7 + 2i)(9 - 6i)

• 75-24i
• 63 - 24i  - 12i²
• 51 - 24i
• 58 + 60i

Tags

CCSS.HSN.CN.A.2

4+3i/5i

• 15/25-20i/25
• 15/25+20i/25
• 20i/25-15/25
• 15/25-20i/25

Use your graphing calculator to graph the function below. Then describe the end behavior.
h(x) = x⁴-3x³ +2x-4

• f(x) falls as x decreases
  f(x) rises as x increases
• f(x) rises as x decreases
  f(x) falls as x increases
• f(x) rises as x decreases
  f(x) rises as x increases
• f(x) falls as x decreases
  f(x) falls as x increases

Use your graphing calculator to graph the function below. Then describe the end behavior.
f(x) = 2x² + 3x - 5

• f(x) falls as x decreases
  f(x) rises as x increases
• f(x) rises as x decreases
  f(x) falls as x increases
• f(x) rises as x decreases
  f(x) rises as x increases
• f(x) falls as x increases
  f(x) falls as x decreases