3. Consider the function f (x) = x³ + 3x2 – 45x + 5, then I. f is decreasing on (-5,3) and increasing on (-0, -5) U (3, 0) II. f has a relative minimum at x = 3. III. f has a relative maximum at x = -5. A. I only B. I and II only C. I and III only D. I, II, and II

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.6: Variation
Problem 8E
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3. Consider the function f (x) = x³ + 3x² – 45x + 5, then
I. f is decreasing on (-5,3) and increasing on (-0, –5) U (3, ∞)
II. f has a relative minimum at x = 3.
III. f has a relative maximum at x = -5.
A. I only
B. I and II only
C. I and III only
D. I, II, and II
Transcribed Image Text:3. Consider the function f (x) = x³ + 3x² – 45x + 5, then I. f is decreasing on (-5,3) and increasing on (-0, –5) U (3, ∞) II. f has a relative minimum at x = 3. III. f has a relative maximum at x = -5. A. I only B. I and II only C. I and III only D. I, II, and II
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