Complex Numbers 3

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Taught by YourMathGal
  • Currently 4.0/5 Stars.
1935 views | 2 ratings
Part of video series
Meets NCTM Standards:
Lesson Description:

Several examples are provided, showing how to simplify square roots of negative numbers, and multiply imaginary numbers, as well as multiply, add and subtract complex numbers in standard form.

More free YouTube videos by Julie Harland are organized at

Questions answered by this video:
  • How do you simplify, add, subtract, multiply, and divide complex number expressions?
  • How do you multiply -2 times the square root of -12?
  • What is 3*sqrt(-7)*2*sqrt(-14)?
  • How do you divide sqrt(-40)/sqrt(-5)?
  • How do you add (3 - 2i) + (6 + 4i)?
  • What is (3 - 2i) - (6 + 4i)?
  • What is (3 + 2i) + (-3 - 5i)?
  • What does -4i*3i equal?
  • What does -5*-2i equal?
  • How do you distribute complex numbers?
  • What is 3i(5 + 7i)?
  • How do you FOIL two complex binomials like (2 + 3i)(6 - 5i)?
  • Staff Review

    • Currently 4.0/5 Stars.
    This lesson picks up from the previous 2 videos. You will now use the skills of simplifying and multiplying square roots of negative numbers, and now complex numbers are added and subtracted as well as distributed. The i is treated just like an x in an algebraic expression, but i^2 just equals -1. This is a great video tutorial for learning computational skills with complex numbers.