Every complex number has a conjugate partner For instance a bi and a bi are conjugate pairs This is significant because whenever you multiply conjugate pairs the imaginary terms will cancel out leaving you with a product that is a Real number a bi a bi a bi a b i a b 1 a 6 We can take advantage of this when attempting to divide Complex numbers because it is preferable to have a denominator that is a Real number instead of Complex Rewrite the expression in a bi form Practice 2 4i 4 i