Simplifying Imaginary Numbers and Adding/Subtracting Complex Numbers

Simplify √-4

• 2i

• -2i

• 2

• 4i

Simplify √-28

• -√28

• -2i√7

• 2i√7

• 28i

Simplify √-23

• -√23

• 23i

• 23

• i√23

Simplify √-81

• -√81

• -9i

• 9i

• 81i

Calculate:
(4 − 7i) − (-3 + 6i)

• 7 − 13i

• 7 − i 

• 1 − 13i

• 1 − i 

Calculate: 
(1 − 2i) + (-4 + 2i)

• -3

• -3 − 4i

• 5 − 4i

• 5

What is the conjugate of the following...
7-2i

• 7 - 2i

• -7 - 2i

• -7 + 2i

• 7 + 2i

What is the conjugate of the following... 4+i

• 4 + i

• -4 + i

• -4 - i

• 4 - i

Rationalize the denominator and simplify completely.

Rationalize the denominator and simplify completely.