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Find all values of x at which f(x)=25x^3/3 +10x^2 + 4x -7 has a horizontal tangent line. If more than one answer, give all of the x values.?

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  • Find all values of x at which f(x)=25x^3/3 +10x^2 + 4x -7 has a horizontal tangent line. If more than one answer, give all of the x values.?


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