Q.

If the roots of x2+x+a=0 exceed a, then

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a

2<a<3

b

-3<a<3

c

a<-2

d

a>3

answer is D.

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Detailed Solution

If the roots of the quadratic equation ax2+bx+c=0 exceed a number k, then ak2+bk+c>0 if a>0, b2-4ac0 and sum of the roots >2k therefore, if the roots of x2+x+a=0 exceed a number a, then a2+a+a>0, 1-4a0 and -1>2a

a(a+2)>0, a14 and a<-12

a>0 or a<-2, a<14 and a<12

Hence a<-2

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