Najwa A.

asked • 07/05/13

complex numbers equation derivation

How is the expansion of the square of |z1+z2| derived?

Robert J.

You can use dot product.

|z1+z2|2

= (z1+z2)·(z1+z2)

= z12 + z1·z2 + z2·z1 + z22 

= z12 + z22 + 2z1·z2

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Attn: z1·z2 = z2·z1

 

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07/05/13

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