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Mathematics 5 Online
OpenStudy (anonymous):

Which is equivalent to (9y2 – 4x)(9y2 + 4x), and what type of special product is it? 81y4 – 16x2, a perfect square trinomial 81y4 – 16x2, the difference of squares 81y4 – 72xy2 – 16x2, a perfect square trinomial 81y4 – 72xy2 – 16x216, the difference of squares thank you in advance c:

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