Answers

2014-07-28T16:02:22+08:00
The nature of the roots of a quadratic equation is determined by the
discriminant        ^      b² - 4ac
x²+ 5x+7= 0      ^  the discriminant is       5²- (4 .1 .7) =  -3
if b²-4ac < 0   ^     the roots are imaginary
so the answer is     A. 0       
0