Solving Complex Number Operations

What is the value of the expression below?

(2 + 4i) + i(2 + i)

• 4 + 5i

• 2 + 7i

• 7i

• 1 + 6i

Multiply
3i(-2 + 4i)

• -6+12i

• -12-6i

• -2+7i

• 12+6i

-i(4-9i)

• -13i

• 13i

• 9 - 4i

• -9 - 4i

The expression (2 + 3i)² is equal to

• -5

• -5 + 12i

• 13

• 13 + 12i

What is the conjugate of
7-2i? 

• 7+2i

• 7-2i

• 2-7i

• 2+7i

• 0

• -i

• 1

• i

√-4

• -2

• -2i

• 2

• 2i

• 10
• -10
• 10i
• -10i

Simplify

• (-10+6i)/17

• (1+50i)/61

• (-23+36i)/25

• (-21+33i)/34

-i(4-9i)

• -13i

• 13i

• 9 - 4i

• -9 - 4i