Chapter 26 Lesson 3

chapter 3 Complex Numbers

Multiple Choice

Simplify.

• -5i
• 5
• 5i
• -5

Multiple Choice

• A
• B
• C
• D

Multiple Choice

√-4

• -2

• -2i

• 2

• 2i

Multiple Choice

2 - √-9

• 2-3i

• 2+3= 5

• 2+3i

• 2 - 3= -1

Multiple Choice

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

• -2+6i
• 12+6i
• -35-16i²
• -35 -16i

Multiple Choice

Simplify: 
(10+ 15i) - (48 - 30i)

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

Multiple Choice

(4 - 2i) - (3 + 6i)

• 7 - 4i

• 1 + 4i

• 1 - 8i

• 7 - 8i

Multiple Choice

(-7 + 9i) + (2 - 10i)

• -5 + i

• -5 - i

• -9 + 1

• 9 - i

Multiple Choice

(3 + 2i) + (4 - 5i)

• 7 + 7i

• 1 - 3i

• 1 - 7i

• 7 - 3i

Multiple Choice

What does i² = ?

• -1
• √-1
• 1
• -√1

Multiple Choice

(2i)(3i)

• 5i
• -5
• 6i
• -6

Multiple Choice

Simplify:
-3i(4 + 2i)

• 6 - 12i
• 6 + 12i
• -12i - 6i²
• -12i + 6i²

Multiple Choice

(-3-i)(6-i)

• -21-7i
• -19-3i
• -15-5i
• -17-9i

Multiple Choice

Solve x² + 25= 0

• x = -5

• x = ± 5i

• x = √5

• x = ± 5

Multiple Choice

Solve. x² + 36 = 0

• x = ± 6

• x = 6i

• x = ± 6i

• x = i√6

Multiple Choice

Solve.

x² + 12 = 5

• x = ± 49

• x = ± i√7

• x = ± √7

• x = ± 3.5i