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f(x) = −x^3 − 3x^2 + 9x + 12 A) use second derivative test to test for relative max/min

f(x) = −x^3 − 3x^2 + 9x + 12 

A) use second derivative test to test for relative max/min

B) Find (x,y) coordinates of point(s) of inflection

C) Define the intervals of concavity

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