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Q)

The quadratic eqn., whose one root is $2-\sqrt 3i$ is given by ?

$\begin{array}{1 1}(A)x^2+4x-7=0 \\ (B) x^2-4x+7=0 \\ (C) x^2+4x+7 =0 \\(D) x^2-4x-7=0 \end{array}$

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