Understanding and using complex number notation

What does i² = ?

• -1
• √-1
• 1
• -√1

What does the imaginary number  $i$   equal?

•  $\sqrt{-1}$  

•  $-1$  

•  $1$  

What is the value of the imaginary unit? i = ?

 $\sqrt{-36}$  

The square root of a negative number is an imaginary number.

• True

• False

• i

• -i

• -1

• 1

True or False?

 $16=-\sqrt{256}$  

• True

• False

Match the following problems with their correct answer

• -5

• 5

• Can't be done.

• -12.5

What does

 $i$  =

•  $-1$  

•  $\sqrt{-1}$  

•  $1$  

•