Complex Numbers and Operations

Multiply
3i(-2 + 4i)

• -6+12i

• -12-6i

• -2+7i

• 12+6i

Where is the mistake?

• Line 2: Should multiply the numerator by 3 + i

• Line 2: Should multiply the denominator by 1 - i

• Line 3: FOILing error

• Line 4: Answers can't be fractions

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

• A
• B
• C
• D

(−3 − i) + 6 + (2 − 6i)

• 5 − 7i

• 1 + 5i

• 2 − i

• 5 + 7i

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

• -2+6i

• 12+6i

• -35-16i²

• -35 -16i

(3 + 2i) + (5 + 4i)

• 6i -8

• -6i -8

• 6i + 8

• -6i + 8

• A

• B

• C

• D

Which of the following is equivalent to 
(5-3i)+(-6+2i)?

• -1-5i

• -1-i

• 11-i

• -30-6i