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Answer to Question #17675 in Calculus for hsd

Question #17675
Let f(x)=x^2−3x−40. Find the open intervals on which f is concave up (down). Then determine the x-coordinates of all inflection points of f.

1. f is concave up on the intervals
2. f is concave down on the intervals
3. The inflection points occur at x =
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