f(x)=x(x^2+6x+25)^(1/2)+3(x^2+6x+25) defined on the interval [-9,3]. All answers refer to x-coordinates. A. f(x) is concave down on the region __ to __. B. f(x) is concave up on the region __ to __. C. the inflection value for the function is __.

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