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COMPLEX NUMBERS. ARITHMETIC OPERATIONS WITH COMPLEX NUMBERS. Which complex representation is the best to use? It depends on the operation we want to perform. ADDITION.

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arithmetic operations with complex numbers
ARITHMETIC OPERATIONS WITH COMPLEX NUMBERS

Which complex representation is the best to use?

It depends on the operation we want to perform.

addition
ADDITION

When performing addition/subtraction on two complex numbers, the rectangular form is the easiest to use. Addition of two complex numbers, C1 = R1 + jI1 and C2 = R2 + jI2, is merely the sum of the real parts plus j times the sum of the imaginary parts.

slide5

C2

C1

I1 - I2

C1+C2

R1 + R2

multiplication of complex numbers
MULTIPLICATION OF COMPLEX NUMBERS

We can use the rectangular form to multiply two complex numbers

If we represent the two complex numbers in exponential form, the product takes a simpler form.

conjugation of a complex numbers
CONJUGATION OF A COMPLEX NUMBERS

The complex conjugate of a complex number is obtained by merely changing the sign of the number’s imaginary part. If

then, C* is expressed as

subtraction
SUBTRACTION

Subtraction of two complex numbers, C1 = R1 + jI1 and C2 = R2 + jI2, is merely the sum of the real parts plus j times the sum of the imaginary parts.

division of complex numbers
DIVISION OF COMPLEX NUMBERS

The division of two complex numbers is also convenient using the exponential and magnitude and angle forms, such as

or

division continued
DIVISION (continued)

Although not nearly so handy, we can perform complex division in rectangular notation by multiplying the numerator and denominator by the complex conjugate of the denominator

inverse of a complex number
INVERSE OF A COMPLEX NUMBER

A special form of division is the inverse, or reciprocal, of a complex number. If C = Mejq, its inverse is given by

In rectangular form, the inverse of C = R + jI is given by