Adding and Subtracting Imaginary Numbers

Simplify.

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

• 2+6i

• -2-6i

• 16+36i

• -16-36i

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

Simplify.

(-6 - 4i) + (1 + 4i) = _______

• -5

• -5+i

• -7-8i

• 5

Choose the correct answer for the operation pictured.

• 7-13i

• 7-i

• 1-13i

• 1-i

(10x + 3i) – (2x – 9i)

• 20x – 27i

• 12x - 7i

• 8x + 12i

• 20x – 27i²

Simplify: 
(10+ 15i)-(48 - 30i)

• 58 - 45i

• 58 - 15i

• -38 - 15i

• -38 + 45i

(3-2i)-(4-2i)=

• -1+0i

• 7-4i

• 1-2i

• -i

Simplify

(9+2i) - 7i + 1

• 10-5i

• 5i

• 10+9i

• 10+5i

(10 + 3i) - (2 - 9i)

• 20 - 27i

• 12 - 7i

• 8 + 12i

• 20 - 27i²