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The conjugate can only be found for a binomial. Let a + b be a binomial. Then, the conjugate of a + b is a - b. Let a - b be a binomial, then the conjugate of a - b is a + b.
Notice that conjugates differ only in the sign of the second term.
Binomials of the form a + bi and a - bi are called complex conjugates.
More examples of conjugates
2 + √5 and 2 - √5The conjugate can be very useful when we are trying to simplify radical expressions or complex numbers.
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