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3 Consider the function (f(x) = x 5x + 3x 4. (a) f is concave up for a (b) f is concave down for

3 Consider the function (f(x) = x 5x + 3x 4. (a) f is concave up for a (b) f is concave down for a (c) The inflection points of occur at x = Note: Input U, infinity, and -infinity for union, , and -, respectively. If there are multiple answers, separate them by commas. If there is no answer, input none.

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