Introduction to Complex Numbers

Multiply: 
(4 – 3i)(7 + 2i)

• A.  22 - 13i
• B.  28 - 19i
• C.  34 - 13i
• D.  -34 - 29i

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

• -2+6i
• 12+6i
• -35-16i²
• -35 -16i

What is i¹²⁹?

• -i
• i
• 1
• -1

i⁷

• i
• -i
• 1
• -1

Simplify √-45

• 3i√5
• -3i√5
• -i√45
• 45i

Find the conjugate of:
5 + 7i

• 5 − 7i
• -5 − 7i
• -5 + 7i

Find the conjugate of:
-4 − 8i

• -4 + 8i
• 4 − 8i
• 4 + 8i

x² + 36 = 0

• x = ±6

• x = 6i

• x = -6

• x = ±6i

Calculate:
(4 − 7i) − (-3 + 6i)

• 7 − 13i
• 7 − i 
• 1 − 13i
• 1 − i 

• (16 + 9i) / 13
• (16 + 9i) / 5
• (20 + 9i) / 13
• (20 + 9i) / 5