Concepts in Complex Numbers

Simplify -√-8

• -i√8
• -2i√2
• 2i√2
• -8i

Simplify 2√-32

• 2i√32
• 4i√2
• 8i√2
• -16i√2

(12 - 5i) + (-3 + 4i)

• A. 9 - i
• B. 15 - 9i
• C. -16 + 63i
• D. 9 - 9i

Evaluate (9 + 3i) (9 - 3i). 

• 81 -9i
• 90
• 81 + 27i -9i²
• 81i - 9

i⁷

• i
• -i
• 1
• -1

Simplify: 
(10+ 15i) - (48 - 30i)

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

What does i² = ?

• -1
• √-1
• 1
• -√1

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

• -2+6i
• 12+6i
• -35-16i²
• -35 -16i

what is the conjugate?

• a
• b
• c
• d

What is the conjugate of -2+5i?

• -5+2i
• -2-5i
• 2+5i
• 5-2i