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f ( x ) = 3x 4 -30x 3+ X- 5 concave upward concave downward f(x) concave upward concave downward 30X -F X 5

f ( x ) = 3x 4 -30x 3+ X- 5 concave upward concave downward

f(x) concave upward concave downward 30X -F X 5

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