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Where is f(x) = x³ - 3x increasing?
Ax > 0 only
B-1 < x < 1
Call real x
Dx < -1 or x > 1
Answer & Solution
Correct answer: D. x < -1 or x > 1
The derivative 3(x² - 1) is positive when x² > 1, that is x < -1 or x > 1.
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