Wang Carroll
10/11/2024 · Senior High School
\begin{tabular}{l} Question \\ Consider the function \( f(x) \) below. Over what open interval(s) is the function decreasing and concave up? Give your answer \\ in interval notation. \\ \( \qquad f(x)=\frac{x^{4}}{4}+\frac{13 x^{3}}{3}+20 x^{2}+36 x-6 \) \\ Enter \( \varnothing \) if the interval does not exist. \\ Provide your answer below: \\ \hline\end{tabular}
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To find the intervals where the function \( f(x) = \frac{x^{4}}{4} + \frac{13 x^{3}}{3} + 20 x^{2} + 36 x - 6 \) is decreasing and concave up, calculate the first and second derivatives, \( f'(x) \) and \( f''(x) \), and analyze their signs. Determine the intervals where \( f'(x) < 0 \) for decreasing and \( f''(x) > 0 \) for concave up.
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