2.4. 1 Geometrical representation of conjugate of a complex number

. . Geometrical representation of conjugate of a complex number Fig. . Fig. . Note Two complex numbers x iy and x iy are conjugates to each other. The conjugate is useful in division of complex numbers. The complex number can be replaced with a real number in the denominator by multiplying the numerator and denominator by the conjugate of the denominator. This process is similar to rationalising the denominator to remove surds.