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28 April, 12:40

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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  1. 28 April, 13:00
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    I believe the answer is the second choice.

    81y^4 - 16x^2, the difference of squares.
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