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Answer:
(1, 3) U (3, ∞)
Explanation:
f(x) increases when values of x are from -∞ to -1.
f(x) increases when values of x are from -1 to 1.
From 1 to just less than 3, f(x) decreases.
From just over 3 to ∞, f(x) decreases.
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