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Bad White [126]
2 years ago
6

Determine the point at which the graph of the function below has a horizontal tangent line. (If the function has no horizontal t

angent line, enter NONE.)
y =x3 + 3x
Mathematics
2 answers:
gregori [183]2 years ago
5 0
But the answer is possibly 9
Maslowich2 years ago
3 0
F ( x ) = x³ + 3 x
Slope of a horizontal line is 0.
f ` ( x ) = 3 x² + 3
3 x² + 3  = 0
3 x² = - 3      / : 3
x² = - 1 ,  which give complex roots.
Answer:  NONE
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