Consider the function and its derivatives: a) Identify the graph that displays f in blue (thick) and f" in red (thin). ? ✓ B. A. ن f(x) = = -4 x² +2 f'(x) +8x (x² + 2)² and ƒ"(x) = −24x2 +16 (x² + 2)3 b) Indicate the x-intervals where f is concave up and concave down. Give your answer in help (intervals). (Type INF for ∞ and -INF for -∞.) f is concave up on f is concave down on 曲

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