Giải phương trình: \({x^2} + 5x - 7 = 0\)
A.\(x = \dfrac{{ - 5 + \sqrt {53} }}{2};x = \dfrac{{ - 5 - \sqrt {53} }}{2}\)
B.\(x = \dfrac{{ - 3 + \sqrt {53} }}{2};x = \dfrac{{ - 3 - \sqrt {53} }}{2}\)
C.\(x = \dfrac{{ - 3 + \sqrt {55} }}{2};x = \dfrac{{ - 3 - \sqrt {55} }}{2}\)
D.\(x = \dfrac{{ - 5 + \sqrt {55} }}{2};x = \dfrac{{ - 5 - \sqrt {55} }}{2}\)
A.\(x = \dfrac{{ - 5 + \sqrt {53} }}{2};x = \dfrac{{ - 5 - \sqrt {53} }}{2}\)
B.\(x = \dfrac{{ - 3 + \sqrt {53} }}{2};x = \dfrac{{ - 3 - \sqrt {53} }}{2}\)
C.\(x = \dfrac{{ - 3 + \sqrt {55} }}{2};x = \dfrac{{ - 3 - \sqrt {55} }}{2}\)
D.\(x = \dfrac{{ - 5 + \sqrt {55} }}{2};x = \dfrac{{ - 5 - \sqrt {55} }}{2}\)
Loga
Hóa Học lớp 12
