What is the product? 6 times open paren x squared minus 1 close paren times the fraction with numerator 6 x minus 1 and denominator 6 times open paren x plus 1 close paren

Factor the difference of squares: x² − 1 = (x − 1)(x + 1). Then 6(x − 1)(x + 1) · (6x − 1)/[6(x + 1)] simplifies by canceling the common factors 6 and (x + 1), leaving (x − 1)(6x − 1). This matches choice D.

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