Let z(1)" and "z(2) be two roots of the ...

Let `z_(1)" and "z_(2)` be two roots of the equation `z^(2)+az+b=0`, z being complex number further, assume that the origin, `z_(1)" and "z_(2)` form an equilateral triangle, then

`a^(2)= 2b`

`a^(2)= 3b`

`a^(2)= 4b`

`a^(2)= b`

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