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21. Let f (x) = x4 + 6x2 + 10x + 8. On which of the following intervals is f(x) convex? Of(x) is convex everywhere

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21. Let f (x) = x4 + 6x2 + 10x + 8. On which of the following intervals is f(x) convex? Of(x) is convex everywhere O (- 1, 1) O (-00, -V/3) and (13,00) O f(x) is concave everywhere O (-00, -1) and (1, 00) O (-V3, V3) JAN 6 . ... tv esc F1 20 F2 F3 F4

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