At what point

At what point is the tangent to f(x)=x^2 + 4x - 1 horizontal?

How do you do that? I think it's asking me at what point is x = 0, or undefined, right??
 

Hurkyl

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Science Advisor
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Hint:

What is the unique feature about the equation of a horizontal line?
How does that relate to tangent lines?
 
Last edited:

mathman

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Horizontal tangent is where derivative=0, that is x=-2.
 

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