Addition and Subtraction
Addition & Subtraction
In the last unit, polynomials had complex roots of the form: a + bi , where 
. A number of the form: a + bi , where a and b are real numbers and , is called a complex number. Here are some examples:
4 + 3i
6i - 2
4i (when a = 0)
-16 (when b = 0)