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z(1) and z(2) are the roots of the eq...

`z_(1) and z_(2)` are the roots of the equation `z^(2) -az + b=0` where `|z_(1)|=|z_(2)|=1` and a,b are nonzero complex numbers, then

A

(a)`abs(a) le 1`

B

(b)`abs(a) le 2`

C

(c)`arg(a)=arg(b^(2))`

D

(d)`arg(a^(2))=arg(b)`

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The correct Answer is:
B, D
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