For what values of x does the graph of f(x) have a horizontal tangent? (Enter your answers as comma-separated list.) f(x) = x3 + 7x² + x + 1

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Hi there. I need help answering this question. I can see I need to get the derivaties, the number then turns into (I think it would be called) a quadratic number, then I must use the quadratic formula. That's where I get a little shaky, but beyond that, I am not sure what to do with the results. I saw in another example that the 2 answers are not anything near what I got. Could you please explain that final part to me? so far, I got -7/3+-(SQRT184)/6...

For what values of x does the graph of f(x) have a horizontal tangent? (Enter your answers as
comma-separated list.)
f(x) = x3 + 7x² + x + 1
Transcribed Image Text:For what values of x does the graph of f(x) have a horizontal tangent? (Enter your answers as comma-separated list.) f(x) = x3 + 7x² + x + 1
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