Question

For the function, find the point(s) on the graph at which the tangent line is horizontal....

For the function, find the point(s) on the graph at which the tangent line is horizontal.

y=x^3-14x^2+9x+9

Select the correct choice below and if necessary, fill in the answer box to complete your choice.

a. The point(s) at which the tangent line is horizontal is(are___

b. The tangent line is horizontal at all points of the graph

c. There are no points on the graph where the tangent line is horizontal.

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