Concepts in complex numbers

is equal to ______

Solve.

 $-\sqrt{144}$  

• 12

• -12

• -72

• Not possible

Solve:

x² + 100 = 0

• 50, -50

• 50i, -50i

• 10, -10

• 10i, -10i

What does i equal?

• -1

• $\sqrt{-1}$

• 1

• -3

The value of i⁴ is...

• 1

• -1

• i

• -i

What does √-1 = ?

• 1
• -1
• i
• i²

What does  $i^2$  equal?

√-169

• 10
• 11
• 12
• no solution