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Q.

If b<0, then the roots x1 and x2 of the equation 2x2+6x+b=0, satisfy the condition x1/x2+x2/x1<k where k is equal to.

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a

-3

b

-5

c

-6

d

-2

answer is D.

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Detailed Solution

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The discriminant of the quadratic equation 2x2 + 6x + b = 0 is given by D = 36 – 8b > 0. Therefore, the given equation has real roots.

We have x1x2+x2x1=x12+x22x1x2=x1+x222x1x2x1x2=(3)22(b/2)b/2=18b2<2

[b<0]

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