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Mathematics, 26.08.2019 05:30 EllaSue

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

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Which is equivalent to (9y2 – 4x)(9y2 + 4x), and what type of special product is it?
81y4 – 1...
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