69) 21) The tangent line of y = In(x² - 8x + 9) is horizontal at x = A) – 2 B) 2 C) 4 D) – 4

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter5: Rings, Integral Domains, And Fields
Section5.4: Ordered Integral Domains
Problem 8E: If x and y are elements of an ordered integral domain D, prove the following inequalities. a....
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69) 21) The tangent line of y = In(x² – 8x + 9) is horizontal at x =
A) – 2
B) 2
C) 4
D) – 4
Transcribed Image Text:69) 21) The tangent line of y = In(x² – 8x + 9) is horizontal at x = A) – 2 B) 2 C) 4 D) – 4
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