Trinomial perfect trianagle, missing answer
1) x^2 + __ + 9 6) __ + 60x + 100 11) 16x^2 + 16x + __
2) x^2 + __ + 36 7) __ + 20xy + 4y^2 12) 121 + 88x + __
3) x^2 + __ + 64y^2 8) __ + 14xy + y^2 13) 25x^2 + 80xy + __
4) 4x^2 + __ + 9) __ + 130x + 25 14)169x^2 + 260xy + __
5) 9x^2 + __ + 49 10) 4x^2 + 36x + __ 15) x^2y^2 + __ + 4
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