Let f (x) = -x – 4.x3 + 6x – 1. Find the open intervals on which f is concave up (down). Then determine the r-coordinates of all inflection points of f is concave up on the intervals toncave down on the intervals inflection points occur at x = h the first two, your answer should either be a single interval, such as (0,1), a comma separated list of intervals, such as (-inf, 2), (3,4), or the word "none". t one, your answer should be a comma separated list of x values or the word "none". u can earn partial credit on this problem.

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