Let f(x) = xell. Determine the intervals of concavity of f(x). f(x) is concave up on (-∞, -1) U (0, ∞) and concave down on O f(x) is concave up on (0, ∞) and concave down on (-∞, 0). 2 O f(x) is concave up on (-1,0) and concave down on (-∞, - (-7, ∞) and concave down on (-∞, f(x) is concave up on (- f(x) is concave up on (-∞, - 2 - -) and concave down on (- 11 (-717,0). 11 -) U (0, ∞). -3/17). 11 ,∞).

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