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  1. Complex numbers | Algebra (all content) | Math | Khan Academy

    This topic covers: - Adding, subtracting, multiplying, & dividing complex numbers - Complex plane - Absolute value & angle of complex numbers - Polar coordinates of complex numbers

  2. Complex numbers | Algebra 2 | Math | Khan Academy

    We'll learn what imaginary and complex numbers are, how to perform arithmetic operations with them, represent them graphically on the complex plane, and apply these concepts to solve quadratic …

  3. Intro to complex numbers (article) - Khan Academy

    Defining complex numbers A complex number is any number that can be written as a + b i , where i is the imaginary unit and a and b are real numbers.

  4. Complex number equations: x³=1 (video) | Khan Academy

    All real numbers are complex numbers, i.e., the real number system is a subset of the complex numbers. Therefore, all this means is if your multiplicities don't add up to the degree when only …

  5. Complex numbers | College Algebra | Math | Khan Academy

    For solutions for more quadratics, we unveiled complex numbers. The good news is, complex numbers follow most of the same patterns as the numbers that came before.

  6. Solving quadratic equations: complex roots - Khan Academy

    Solving quadratic equations can lead to complex solutions. Listen to Sal break down the process using the quadratic formula and standard form. Then, learn how to verify these complex solutions, ensuring …

  7. Complex numbers and quadratic equations | Khan Academy

    Algebra of complex numbers This lesson covers skills from the following lessons of the NCERT Math Textbook: (i) 4.3 - Algebra of complex numbers

  8. Algebra of complex numbers (video) | Khan Academy

    In this video, we talk about how we use operators in the complex world. We look at the properties of addition of complex numbers first. We then look which of these properties also hold true for …

  9. Multiplying complex numbers (video) | Khan Academy

    Discover how to multiply complex numbers! Just like multiplying regular numbers, you can use the distributive property or FOIL method. Remember, the imaginary unit 'i' squared equals -1. So, when …

  10. More on quadratics & complex numbers | Khan Academy

    Practice Parts of complex numbers Get 3 of 4 questions to level up! Practice Not started