i really need help...
Square both sides and use |u|^2 = u u bar to get
(z + 1)(z bar + 1) <= (z - 1)(z bar - 1).
Then multiply out and cancel common terms to get
2 ( z + z bar) <= 0.
If z = a + b i then this simplifies to just a <= 0, the left half of the plane.
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Square both sides and use |u|^2 = u u bar to get
(z + 1)(z bar + 1) <= (z - 1)(z bar - 1).
Then multiply out and cancel common terms to get
2 ( z + z bar) <= 0.
If z = a + b i then this simplifies to just a <= 0, the left half of the plane.