Imaginary Number Units

What is the result of adding Z1 and Z2, where Z1 = 3 + 2i and Z2 = -4 + i?

• -1 + 3i

• -1 - 3i

• 1 + 3i

• 1 - 3i

What is the result of subtracting Z2 from Z1, where Z1 = 3 + 2i and Z2 = -4 + i?

• 7 + i

• 7 - i

• -7 + i

• -7 - i

What is the representation of the complex number 7 + i on an argand diagram?

• 7 units to the right, 1 unit up

• 7 units to the left, 1 unit down

• 7 units to the right, 1 unit down

• 7 units to the left, 1 unit up

Another way to express √-1 is?

• 1

• -1

• i

• 0

Which of the following are true? Select all that apply.

• i = i

• i² = -1

• i³ = -i

• i⁴ = 1

• 1

• -1

• i

• 0

• 5i
• -5i
• 5+i
• -5