Complex numbers Jan 17th

What does i² = ?

• -1
• √-1
• 1
• -√1

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

• -2+6i
• 12+6i
• -35-16i²
• -35 -16i

(10-6i) - (2+3i)

• 12 + 3i
• 8 - 3i
• 8 - 9i
• -9i + 8

Simplify
3i - (4 + 7i)

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

The product of (3 -2i) and (7+6i) is

• 21 - 12i
• 9 + 4i
• 33 + 4i
• 21 + 16i

-i(4-9i)

• -13i

• 13i

• 9 - 4i

• -9 - 4i

(7 - 5i)(7 + 5i)

• 74
• 24
• 49 - 25i
• 49 + 25i

What is the simplified form of the above?

• 7/10 + 11/10 i

• 13/10 +1/10 i

• 5/4 - 3/2i

• 7/10 - 11/10 i

Simplify

• (-10+6i)/17

• (1+50i)/61

• (-23+36i)/25

• (-21+33i)/34

What is the conjugate of
7-2i? 

• 7+2i
• 7-2i
• 2-7i
• 2+7i