For what values of x does the graph of f(x) = x3 + 6x² + x + 4 have a horizontal tangent? X = (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section: Chapter Questions
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For what values of x does the graph of f(x) = x3 + 6x² + x + 4 have a horizontal tangent?
X =
(Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)
Transcribed Image Text:For what values of x does the graph of f(x) = x3 + 6x² + x + 4 have a horizontal tangent? X = (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)
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