View more at http://www.MathTutorDVD.com. In this lesson, will get practice with simplifying expressions that contain imaginary numbers. What we will find is that imaginary numbers can be added, subtracted, and multiplied and divided. We just need to remember that anytime you square the imaginary number "i" the result of -1. Anytime we need to add imaginary numbers, we add them just like regular algebraic terms.