On which interval is the function f(x) = x2 - 2x - 8 decreasing? A [-2, 4] B (-∞, 4) C (-2, 4) D (-∞, 1) E (1, ∞)

Algebra for College Students
10th Edition
ISBN:9781285195780
Author:Jerome E. Kaufmann, Karen L. Schwitters
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Chapter8: Functions
Section8.2: Linear Functions And Applications
Problem 33PS
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On which interval is the function f(x) = x2 - 2x - 8 decreasing? 

A [-2, 4] 

B (-∞, 4) 

C (-2, 4) 

D (-∞, 1) 

E (1, ∞) 

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