27: The domain is D( f ) = (−∞,−2) ∪ (−2,∞).
The second derivative is

Dividing points: The equation f ′′(x) = 0 has solution x = 1.
There are no points in D( f ) where the second derivative does not exist.

Intervals of concavity will be (−∞,−2), (−2,1], and [1,∞). Determine concavity and points of inflection using a chart.

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