Complex Numbers Extra Practice

What does i² = ?

• -1
• √-1
• 1
• -√1

Simplify 
√-25

• -5i
• 5
• 5i
• -5

Simplify:
√-108

• 3i√6
• 3i√20
• 6i√3
• 20i√3

Simplify
2i - 7i + 10

• -5i+10
• 5i
• 9i+10
• 5i+10

Simplify
3i - (4 + 7i)

• -4 + 10i
• 21 - 12i
• 4 - 10i
• -4 - 4i

Multiply
(2i)(3i)

• 5i
• -5
• 6i
• -6

Simplify: 
(7 + 2i)(9 - 6i)

• 75 - 24i

• 63 - 24i  - 12i²

• 51 - 24i

• 58 + 60i

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

• -2+6i
• 12+6i
• -35-16i²
• -35 -16i

Multiply (4 – 3i)(7 + 2i)

• A.  22 - 13i

• B.  28 - 19i

• C.  34 - 13i

• D.  -34 - 29i

How do you write a complex number?

• a-bi

• a+bi

• ai+b

• ai-b