Question: Suppose f(x) = 2x3 + 6x2 - 144x - 3. Determine the value(s) of a for which f (x ) has a horizontal tangent line.

Suppose f(x) = 2x3 + 6x2 - 144x - 3. Determine the value(s) of a for which f (x ) has a horizontal tangent line. Separate multiple values with a comma
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