QUESTION 15 Let f(x) = x^4 - 3x^3 + 3x^2 - 1. Find the intervals on which the graph of f(x) is concave down. A. (0, 1/2) and (2, ?) B. (-?, 1) only C. (-?, 1/2) and (1, ?) D. (1/2, 1) only E. (1, ?) only QUESTION 16 Given y = ln((3x^2 + 1) / ?(x + 1)) find dy/dx. HINT: Use the properties of the logarithm function first. A. 6x + 1 - ?(x + 1) B. (3x^2 + 1) / 6x - 1/2 ?(x + 1) C. ?(x + 1) / (3x^2 + 1) D. (6x + 1) / ln(3x^2 + 1) + 1 / (2 ln(2x - 1)) E. 6x / (3x^2 + 1) - 1 / (2(x + 1))
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