Question: 1. Let f(x) = 1x 3x - 4x 3. Find the 1x-3x - interval where f is concave up. If an end-point of the

1. Let f(x) = 1x 3x - 4x 3. Find the 1x-3x - interval where f is concave up. If an end-point of the interval is either -00 or + type "infinity" (without quotation marks). Answer: < x < Find the interval where fis concave down. If necessary, indicate - or too by typing "infinity" (no quotation marks). Answer: < x < Find the inflection point of f. Answer: x=

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