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Over which interval does the cubic 2x³ − 9x² + 12x + 5 lose height?
A(0, 3)
B(−∞, 1)
C(2, ∞)
D(1, 2)
Answer & Solution
Correct answer: D. (1, 2)
f'(x) = 6(x − 1)(x − 2) is negative only between the roots 1 and 2.
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