Find all the values of x where the tangent line is horizontal. f(x)=2x3+39x2+252x+9 x= (Simplify your answer. Use a comm
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Find all the values of x where the tangent line is horizontal. f(x)=2x3+39x2+252x+9 x= (Simplify your answer. Use a comm
Find all the values of x where the tangent line is horizontal. f(x)=2x3+39x2+252x+9 x= (Simplify your answer. Use a comma to separate answers as needed.)
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