Now we will work with special pairs of binomial radical expression such
as the following:
Notice that in each binomial pair, the first terms are the same and the
second terms differ only in sign.
Such pairs of binomial radical expressions are called conjugates.
Two binomial radical expressions of the form
are called conjugates.
Here, a, b, c, and d are rational numbers. Also,
The product of conjugates is a rational number.