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OpenStudy (anonymous):
The graph of f(x) = 2x^3 + 12 x^2 - 126 x + 16 has two horizontal tangents. One occurs at a negative value of x and the other at a positive value of x. What is the negative value of x where a horizontal tangent occurs? What is the positive value of x where a horizontal tangent occurs?
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OpenStudy (accessdenied):
How would you find the x values where horizontal tangents occur?
OpenStudy (anonymous):
x=0
OpenStudy (accessdenied):
How did you find that?
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