Introduction to Imaginary Numbers

Simplify.

• -5i

• 5

• 5i

• -5

Simplify √-4

• 2i

• -2i

• 2

• 4i

Simplify √-23

• -√23

• 23i

• 23

• i√23

Simplify -√-48

• 4i√3

• -4i√3

• i√48

• -48i

What letter usually represent imaginary number?

• a

• i

• j

• x

• e

Answer explanation

• 10
• -10
• 10i
• -10i

Simplify √-81

• -√81

• -9i

• 9i

• 81i

Simplify √-28

• -√28

• -2i√7

• 2i√7

• 28i

Simplify √-45

• 3i√5

• -3i√5

• -i√45

• 45i

Simplify -√-8

• -i√8

• -2i√2

• 2i√2

• -8i