For what value(s) of x does the function f(x)= 4x3-x2-2x+5 have a horizontal tangent line?  a.) x= -1/3 , 1/2 b.) 3, -2 c.) -3, 2  d.) 1/3, -1/2

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 55E
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For what value(s) of x does the function f(x)= 4x3-x2-2x+5 have a horizontal tangent line? 

a.) x= -1/3 , 1/2

b.) 3, -2

c.) -3, 2 

d.) 1/3, -1/2 

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