alleryStart learning →The function f(x) = x^3 - 3x has a local maximum at x =
A0
B3
C-1
D1
Answer & Solution
Correct answer: C. -1
f'(x) = 3x^2 - 3 is zero at x = ±1, and f''(x) = 6x is negative only at x = -1.
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