1.

If the function f(x)=x^(3)+3(a-7)x^(2)+3(a^(2)-9)x-1has a positive point of maximum , then

Answer»

`a in (3,oo)uu(-oo,-3)`
`a in(-oo,-3)uu(3,(29)/(7))`
`(-oo,7)`
`(-oo,(29)/(7))`

ANSWER :B


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