Topic 2-4: Complex and Imaginary Numbers

What does i² =  ?

• 1

• -1

• √-1

• √1

Simplify:

(10 + 15i) - (48 - 30i)

• 58 - 45i

• 58 - 15i

• -38 - 15i

• -38 + 45i

Find the sum.

(5 - 2i) + (-7 + 8i)

• -2 + 6i

• 12 + 6i

• -35 - 16i²

• -35 - 16i

Multiply:

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

• 29

• 4 - 25i

• 25 - 10i

• -21

(2i)(3i)

• 5i

• -5

• 6i²

• -6

Simplify the division problem: 
(2-4i)/(1+3i)

• -1-i

• (2-12i²)/10

• (5+5i)/4

• (-10-10i)/10

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

• -2+6i

• 12+6i

• -35-16i²

• -35 -16i

Calculate:
-4 (13 + 5i) 

• -52 − 20i

• 9 + i

• 17 − 20i

• -52 + 20i

Simplify: √-64

• -8

• 8i

• -8i

• 8

Simplify: √-25

• 5

• -5

• 5i

• -5i