Complex numbers are numbers that can be expressed in the form a+bi. A and B are real numbers, and [i]i[/i] is an imaginary number. If a=0 then the number is imaginary, and if b=0 then the number is real. This helps the FTA, because it tells the number of real solutions in the quadratic equations. [br][br]Graph:https://www.desmos.com/calculator/uxylaz74wc