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Find the values ' a ' for which the func...

Find the values `' a '` for which the function `f(x)=(a+2)x^3-3a x^2+9a x-1` decreases for all real values of `x` .

A

`(-oo, -3)`

B

`(-oo ,0)`

C

`(-3,0)`

D

`(-3,oo)`

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A
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Knowledge Check

  • The value of p so that the function f(x) i= sin x - cos x - px + q decreases for all real values of x is given by

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    `[-1, infty)`
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    `(-infty, - 2]`
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