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

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter4: Calculating The Derivative
Section4.1: Techniques For Finding Derivatives
Problem 36E: Find all points on the graph of fx=x3+9x2+19x-10 where the slope of the tangent line is -5.
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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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