Learn how to multiply complex numbers using the fact that i^2=-1 and the distributive property. For example, multiply (1+i) by (2+3i).
What_are_the_imaginary_numbers_
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).
Learn about complex numbers (spoiler: they are numbers that consist of both real and imaginary parts).
Adding_and_subtracting_complex_numbers
Learn how to add or subtract complex numbers. For example, write (2+3i)-(1+2i) as (1+i).
Learn how we can visualize complex numbers in a plane. This can be seen as an expansion of the 1-dimensional real number line into a 2-dimensional plane!
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