Answer
At x = -1 and x = 1.
Explanation
The derivative is f'(x) = 3x^2 - 3. Setting it to zero gives x^2 = 1, so the slope is zero at x = -1 and x = 1.
Home / Library / CSAT (Suneung) essentials: original practice / Synthetic flashcard
For f(x) = x^3 - 3x, at which x-values is the tangent line horizontal?
Study flashcard from the deck CSAT (Suneung) essentials: original practice.