Complex Number Simplification

Simplify: 
(10+ 15i)-(48 - 30i)

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

Simplify: 
(7 + 2i)(9 - 6i)

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

• 10
• -10
• 10i
• -10i

What does i² = ?

• -1
• √-1
• 1
• -√1

Simplify:
3√-81

• -27
• 3i√3
• 27i
• 9i

Simplify:
√-108

• 3i√6
• 3i√20
• 6i√3
• 20i√3

Simplify -4√-63

• 3i√7
• -12i√7
• -12√7
• 36√7

Simplify
2i - 7i + 10

• -5i+10
• 5i
• 9i+10
• 5i+10

Simplify
3i - (4 + 7i)

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

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

• -2+6i
• 12+6i
• -35-16i²
• -35 -16i