1.

For any two complex numbers z_(1) & z_(2) and any two real numbers a , b |az_(1)- bz_(2)|^(2) + |bz_(1) + az_(2)|^(2) =

Answer»

`(a^(2) - B^(2)) (|z_(1)|^(2) + |z_(2)|^(2))`
`(a^(2) + b^(2)) (|z_(1)|^(2) + |z_(2)|^(2))`
`(a^(2) + b^(2)) (|z_(1)|^(2) - |z_(2)|^(2))`
`(a^(2) -b^(2)) (| z_(1)|^(2) - |z_(2)|^(2))`

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