Imaginary and Complex Numbers Adding Subtracting

Simplify.

(9 +21i) + (-7 - 15i)

• 2+6i

• -2-6i

• 16+36i

• -16-36i

Select all that are true.

• √ -1 is an imaginary number

• There are no real numbers that satisfy the equation x=√-1.

• Because √-1 is imaginary, we cannot do math with it.

• The equation x²=-1 has real solutions.

• √-1 = -1 because -1⋅-1 = -1

Find all solutions to each equation, real or imaginary.

x²=-36

• 6,-6

• 6

• -6

• 6i, -6i

Write the expression in the form of a+bi, where a and b are real numbers.

3 ⋅ √-25

• 15

• -15

• 15i

• -15i

• A
• B
• C
• D

Choose the correct answer for the operation pictured.

• 7 - 13i

• 7 - i

• 1 - 13i

• 1 - i

Choose the correct answer for the operation pictured.

• 7-13i

• 7-i

• 1-13i

• 1-i

• A

• B

• C

• D

• A
• B
• C
• D

• A
• B
• C
• D