Which shows a perfect square trinomial?

50 y squared minus 4 x squared
100 minus 36 x squared y squared
16 x squared + 24 x y + 9 y squared
49 x squared minus 70 x y + 10 y squared

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  1. 16 x squared + 24 x y + 9 y squared if you meant
    16x^2 + 24xy + 9y^2

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