Operations with complex numbers

You can add and subtract like terms of complex numbers in the same way you add or subtract other like terms.

Try simplifying 4i+5i

• -1i

• 9i

• 20i

• 1i

Now that we've practiced identifying our real and imaginary parts, let's try adding complex numbers

What is the sum of 6+3i and 7+12i

• 18+10i

• 13+15i

• 15+13i

• 10+18i

Find the sum of 7+8i and 6-2i

• 13 + 6i

• 1 + 6i

• 13 + 10i

• 1 + 10i

Simplify.

(-5 - 5i) - (-3 + 6i)

(5-i)(5-i)

• 15-8i
• 36
• 24+10i
• 24-10i

(2i)(3i)

• 5i
• -5
• 6i
• -6

(-3-i)(6-i)

• -21-7i
• -19-3i
• -15-5i
• -17-9i