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If the equation |x^2+b x+c|=k has four r...

If the equation `|x^2+b x+c|=k` has four real roots, then a. `b^2-4c > 0` and `0 < k < (4c-b^2)/4` b. `b^2-4c < 0` and `0 < k < (4c-b^2)/4` c. `b^2-4c > 0` and `k > (4c-b^2)/4` d. none of these

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