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Consider the function f(x) = 7x2 + 5 (a) f is concave up for x E (b) f is concave down for x E (c)

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Consider the function f(x) = 7x2 + 5 (a) f is concave up for x E (b) f is concave down for x E (c) The inflection points of f occur at x = Note: Input U, infinity, and -infinity for union, oo, and -oo, respectively. If there are multiple answers, separate them by commas. If there is no answer, input none

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