To find the domain of the product \( (fg)(x) \), where \( f(x) = 6x^2 - 2x \) and \( g(x) = 2x \), we need to consider the domains of both \( f(x) \) and \( g(x) \).
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Domain of \( f(x) = 6x^2 - 2x \): This is a polynomial function, which is defined for all real numbers.
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Domain of \( g(x) = 2x \): This is also a polynomial function, and thus is defined for all real numbers.
Since both functions are defined for all real numbers, the product \( (fg)(x) = f(x)g(x) \) will also be defined for all real numbers.
Therefore, the domain of \( (fg)(x) \) is:
the set of all real numbers.