the roots of the equation x2-7x+15=0,a.imaginaryb.real,rational,and equalc.real,irration,and unequald.real,rational,and unequal

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the roots of the equation x2-7x+15=0,
a.imaginary
b.real,rational,and equal
c.real,irration,and unequal
d.real,rational,and unequal

答:
A
b^2-4ac=(-7)^2-4*15=-11<0
方程有两个共轭虚根.
A是虚根