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Complex Numbers - Multiplying and Dividing

By PatrickJMT

This video lesson contains a few example problems on multiplying and dividing complex numbers. For multiplication, the FOIL method is discussed, and for division, the idea of complex conjugates is discussed.

Complex Numbers: Multiplying and Dividing in Polar Form, Ex 2

By PatrickJMT

Complex Numbers: Multiplying and Dividing in Polar Form, Ex 2. In this video, I give the formula for multiplication and division of two complex numbers that are in polar form.

Complex Numbers: Multiplying and Dividing in Polar Form, Ex 1

By PatrickJMT

Complex Numbers: Multiplying and Dividing in Polar Form, Ex 1. In this video, I give the formula for multiplication and division of two complex numbers that are in polar form.

16 - Add and Multiply Complex Numbers - Part 1

By Math and Science

Quality Math And Science Videos that feature step-by-step example problems!

Complex Numbers (part 1)

By Khan Academy

Introduction to complex numbers. Adding, subtracting and multiplying complex numbers.

Complex Numbers (part 1)

By Khan Academy

Introduction to complex numbers. Adding, subtracting and multiplying complex numbers.

Multiplying complex numbers

By Khan Academy

Sal multiplies (1-3i) by (2+5i).

Complex Number Operations

By Mathispower4u

This video lesson shows how to add, subtract, multiply, and divide complex numbers

An Example of Finding a Complex Conjugate

By Khan Academy

This video shows us how to find the complex conjugate of a complex number, then shows us one of the most useful uses of the complex conjugate. If you ever multiply two complex conjugates, you will get a real number as a result. This is very useful when we start dividing complex numbers!

Multiplying and dividing complex numbers in polar form

By Khan Academy

Sal shows how complex division affects the modulus and the argument of the divisor and the dividend.

Customary Unit Conversions | MathHelp.com

By MathHelp.com

This lesson covers complex numbers. Students learn that a complex number is the sum or difference of a real number and an imaginary number and can be written in a + bi form. For example, 1 + 2i and -- 5 - i root 7 are complex numbers. Students then learn to add, subtract, multiply, and divide complex numbers that do not contain radicals, such as (5 + 3i) / (6 - 2i). To divide (5 + 3i) / (6 - 2i), the first step is to multiply both the numerator and denominator of the fraction by the conjugate of the denominator, which is (6 + 2i), then FOIL in both the numerator and denominator, and combine like terms.

Completing the square (old school)

By Khan Academy

This video lecture series on Algebra from Khan Academy includes Linear Equations, Solving Inequalities, Slope and Y-intercept, Equation of a Line, Averages, Integer sums, Taking Percentages, Systems of Equations, Ratios, Multiplying Expressions, Solving a quadratic by factoring, Imaginary Numbers, Complex Numbers, Quadratic Equations, Quadratic Inequalities, Functions, Conic sections, Circles, Ellipses, Hyperbolas......