Consider the following function.

$f(x)=x^3-3x^2-9x3$

Find the first and second derivatives.

$f^{\text{'}}(x)=$

$f^{\text{'}}(x)=$

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Find any values of $c$ such that $f^{\text{'}}(c)=0.($Enter your answer as a comma$-$separated ist. If any answer does not exist, en $c=$

Find the infival$($s$)$ on which $r$ is concave up$.($Inter your answer uning interval notation.$)$

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Find the interval$($s$)$ on which $f$ is concave down. $($Enter your answer using interval notation.$)$

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Find the infection point of $f.$

$(x,y)=()$