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Which set of x values makes x³ − 3x strictly decreasing?
A(0, ∞)
B(−∞, −1)
C(−∞, 0)
D(−1, 1)
Answer & Solution
Correct answer: D. (−1, 1)
f'(x) = 3(x² − 1) is negative only when |x| < 1.
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