Which statement describes the domain of the function f of x is equal to the fraction with numerator 3 x and denominator 4 x squared minus 4 ?

A rational function is undefined wherever its denominator equals zero. Solve 4x² − 4 = 0: factoring gives 4(x − 1)(x + 1) = 0, so x = 1 or x = −1. Excluding those values leaves all real numbers except −1 and 1, which is choice D.

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