(b) (2 points) use the Concavity Theorem to determine where f(x) is concave up and where it is concave down/Also find all inflection points. if f"x)>0 For all x in an open interval, then it is concave up on that interval. if fu(X)<0 For all x in an open interval, then it is concave down on thut in terval. f"(x) - 3x²-2x-6

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