Which is equivalent to (9 y squared minus 4 x)(9 y squared + 4 x), and what type of special product is it?
81 y Superscript 4 Baseline minus 16 x squared, a perfect square trinomial
81 y Superscript 4 Baseline minus 16 x squared, the difference of squares
81 y Superscript 4 Baseline minus 72 x y squared minus 16 x squared, a perfect square trinomial
81 y Superscript 4 Baseline minus 72 x y squared minus 16 x squared, the difference of squares
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