Adding and Subtracting and Multiplying Complex Numbers

(i)(3i)

• -3i
• -3
• 3
• 2i

(-3-i)(6-i)

• -21-7i
• -19-3i
• -15-5i
• -17-9i

(-4i)(3i)(4i)

• 24
• -48i
• 48i
• 60

Simplify:
3√-81

• -27
• 3i√3
• 27i
• 9i

What does i² = ?

• -1
• √-1
• 1
• -√1

Simplify.

• -5i
• 5
• 5i
• -5

Another way to express √-1 is?

• 1

• -1

• i

• 0

A complex number can be expressed as a + bi. What does a represent?

• the real part of the complex number

• the imaginary part of the complex number

• depends on the sign of the number

• the square root of the complex number

If you are adding two complex numbers you should

• add all the numbers together then divide by 2

• add only the real numbers and subtract the complex numbers

• add only the complex numbers and subtract the real numbers

• add only the real numbers together and then add only the complex numbers together then stop

What is the standard form for a complex number?

• -8i
• a + bi
• bi + a
• -8i + 8