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JEE MATHEMATICS MCQ: INCREASING & DECREASING

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Application +4 | -1
Let f(x)=x3+6x2+ax+2f(x)=x^{3}+6 x^{2}+a x+2, if (−3,−1)(-3,-1) is the largest possible interval for which f(x)f(x) is decreasing function, then a=a=
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Correct option: B
9
Option B (9) is correct because using the derivative and the given interval, we can determine the value of 'a'.

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