Peter G.

asked • 11d

Brief Calculus.

The graph of f(x)=2x^3+3x^2−120x+23 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?

x=


What is the positive value of x where a horizontal tangent occurs?

x=


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