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2x^{2}+12x+15
2(x+3)²-3
x^{2}+4x
...
5x^{2}-20x+16
-4x^{2}-24x-39
-5x^{2}-10x-7
-4x^{2}+16x-18
2x^{2}+20x+54
-5x^{2}-20x-23
-3x^{2}+6x
4x^{2}+32x+60
-3x^{2}-18x-25
x^{2}-8x+14
-5x^{2}-20x-17
-x^{2}-6x-10
-2x^{2}-20x-49
-x^{2}+4x
-5x^{2}+30x-46
5x^{2}+30x+45
-2x^{2}+12x-16
x^{2}+10x+26
5x^{2}+10x+9
-5x^{2}-50x-129
-2x^{2}+8x-4