Imaginary Numbers Intro

What are the zeros of the function f(x) = x² + 64?

• -8 and 8

• -8i and 8i

• (-√8) i and (√8) i

• -√8  and √8

i⁴³

•  i

•  -i

•  -1

•  1

i¹⁹

•  i

•  -i

•  -1

•  1

What letter usually represents an imaginary number?

• a

• i

• j

• x

• -24i√7

• 24i√7

• -24√7

• 24√7

x² + 36 = 0

• x = ±6

• x = 6i

• x = -6

• x = ±6i

33 = 18 - 3x²

• x = ±5i

• x = ±i√5

• x = ±√5

• x = i√5

• i

• -1

• -i

• 1

Which of the following are imaginary numbers?

• 0

• -i

• 4-2i

• i

• -1

• -i

• 1