Khan Academy: Algebra: Complex Numbers: Subtracting Complex Numbers

Video shows working a problem from the IIT JEE test which involves using algebraic manipulation to determine the validity of an equation with magnitudes of the differences of certain complex numbers. [7:21]

Video shows working a problem from the IIT JEE test which involves algebraic manipulation and using what the argument of complex numbers is to visually reason if two given equations about arguments are true. [7:26]

Video shows working a problem from the IIT JEE test which involves determining whether the determinant of a matrix of four given complex numbers is 0. [3:09]

Video shows an example of multiplying complex numbers. [5:32]

Video shows an example of dividing complex numbers using complex conjugates. [4:58]

Video shows how to use the quadratic formula to find roots of a quadratic equation in a situation where the roots are complex. Includes showing how to verify the answers are correct solutions of the quadratic. [10:15]

Video shows an example of adding complex numbers. Includes link to additional practice problems. [1:11]

Video first reviews what natural numbers, whole numbers, integers, rational numbers, irrational numbers and real numbers are. Gives examples of classifying numbers. [5:17]

Video explains in which number sets in the real number system that a specific repeating decimal belongs. Shows method for rewriting the repeating decimal as a fraction. [6:52]

Video shows how to divide complex numbers by using complex conjugates in general terms and then with a specific example. [8:58]