Khan Academy Static

Learn about the imaginary unit i (which is the square root of -1) and about imaginary numbers like 3i (which is the square root of -9).

3435_Simplifying_roots_of_negative_numbers.html

3434_Intro_to_the_imaginary_numbers.html

3437_i_as_the_principal_root_of_1.html

3436_Powers_of_the_imaginary_unit.html