Imaginary Numbers

Which of the following are equivalent to i⁴⁴? Select all that apply.

• i⁴

• -1

• i²

• 1

• -1

Simplify

• ± 2i √10
• ± 2 √10
• ± 4i √10
• ± 4 √10

Calculate: 
(1 − 2i) + (-4 + 2i)

• -3
• -3 − 4i
• 5 − 4i
• 5

A complex number can be expressed as a + bi. What does a represent?

• the real part of the complex number

• the imaginary part of the complex number

• depends on the sign of the number

• the square root of the complex number

• 5i

• -5i

• 5+i

• -5

The product  $\left(6+2i\right)\left(4-3i\right)$ can be written as

•  $24-6i$  

•  $18+10i$  

•  $2+5i$  

•  $30-10i$  

Simplify.

• 
• 
• 
• 

i¹³

• -1
• 1
• i
• -i

Simplify: 
(10+ 15i)-(48 - 30i)

• 58 - 45i
• 58 - 15i
• -38 - 15i
• -38 + 45i