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If c^2 = 4d and the two equations x^2 - ...

If `c^2` = 4d and the two equations `x^2` - ax + b = 0 and `x^2` - cx + d = 0 have one common root. then the value of 2(b+d)) is equal to (A) ? 13) ac (C) 2ac (D) ane

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