Complex Number Operations Add Subtract Multiply

• -24i√7

• 24i√7

• -24√7

• 24√7

• 6i√5

• -8√5

• 8i√5

• -8i√5

Simplify.

• -5i

• 5

• 5i

• -5

Subtract:

(3 - 2i) - (-9 + i )

• 12 - 3i

• -6 - i

• -25 + 21i

• 9i

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

Add:

(5 + 1.2i) + (-6 + 0.8i)

• 11 + 0.4i

• -30.96 - 3.2i

• -1.2 + 1.5i

• -1 + 2i

Multiply:

3i(5 - 4i)

• 15 - 4i

• 12 + 15i

• 8i + 7i²

• 3i²

Multiply:

(5 + 2i)(5 - 2i)

• 10

• 29

• -21

• 20

-i(4-9i)

• -13i

• 13i

• 9 - 4i

• -9 - 4i

The expression (2 + 3i)² is equal to

• -5

• -5 + 12i

• 13

• 13 + 12i