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The graph of f(x)=2x^3+12x^2−72x+8 has two horizontal tangents. One occurs at a negative value of x...

The graph of f(x)=2x^3+12x^2−72x+8 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?

Math   Calculus   
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