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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^2-4cgt0 and 0ltklt(4c-b^2)/ 4`
B. `b^2-4clt0 and 0ltklt(4c-b^2)/4`
C.`b^2-4cgt0 and kgt(4c-b^2)/4`
D. none of these

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