Examine y = 3x4 − 10x3 − 12x2 + 12x − 7 for concavity and points of inflection. Which of the following statement is incorrect?

Elementary Geometry for College Students
6th Edition
ISBN:9781285195698
Author:Daniel C. Alexander, Geralyn M. Koeberlein
Publisher:Daniel C. Alexander, Geralyn M. Koeberlein
Chapter4: Quadrilaterals
Section4.4: The Trapezoid
Problem 34E
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49. Examine y = 3x4 − 10x3 − 12x2 + 12x − 7 for concavity and points of inflection. Which of the following statement is incorrect?

I. When x < −1/3, the arc is concave upward.

II. When −1/3 ≤ x < 2, the arc is concave downward.

III. When x > 2, the arc is concave upward.

IV. Point (2, -53) is the point of inflection.

a. I c. II b. III d. IV

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