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Question

The complete set of values of 'a' such that  x2+ax+a2+6a < 0 x ϵ [-1, 1] is:



A

 

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B

 

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C

 

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D

None of these 

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Solution

The correct option is D

None of these 


f(x) = x2+ax+a2+6a<0 

f(-1) < 0 , f(1) < 0 , D < 0.

a24(a2+6a) > 0,a2+7a+1<0,a2+5a+1<0 

-8 < a < 0, 7452 < a < 7+452
and 5212 < a <5+212
5212 < a < 5+212

Mathematics

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