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Question

If z1 and z2 are two complex numbers, then prove that
|z1|+|z2|=z1+z22+z1z2+z1+z22z1z2

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Solution

RHS=z1+z2+2z1z22+z11z22z1z22
=|z1+z2|22+|z1z2|22
=|z1|+|z2|+2z1z2+|z1|+|z2|2z1z22
=2(|z1|+|z2|2)=|z1|+|z2|=LHS
Q.E.D

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