Giải phương trình \({x^2} + 5x + 3 = 0\)
A.\({x_1} = \dfrac{{ - 5 + \sqrt {13} }}{2};{x_2} = \dfrac{{ - 5 - \sqrt {13} }}{2}\)
B.\({x_1} = \dfrac{{ - 5 + \sqrt {11} }}{2};{x_2} = \dfrac{{ - 5 - \sqrt {11} }}{2}\)
C.\({x_1} = \dfrac{{ - 5 + \sqrt {15} }}{2};{x_2} = \dfrac{{ - 5 - \sqrt {15} }}{2}\)
D.\({x_1} = \dfrac{{ - 5 + \sqrt {17} }}{2};{x_2} = \dfrac{{ - 5 - \sqrt {17} }}{2}\)
A.\({x_1} = \dfrac{{ - 5 + \sqrt {13} }}{2};{x_2} = \dfrac{{ - 5 - \sqrt {13} }}{2}\)
B.\({x_1} = \dfrac{{ - 5 + \sqrt {11} }}{2};{x_2} = \dfrac{{ - 5 - \sqrt {11} }}{2}\)
C.\({x_1} = \dfrac{{ - 5 + \sqrt {15} }}{2};{x_2} = \dfrac{{ - 5 - \sqrt {15} }}{2}\)
D.\({x_1} = \dfrac{{ - 5 + \sqrt {17} }}{2};{x_2} = \dfrac{{ - 5 - \sqrt {17} }}{2}\)
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