(x+2)^2 - x^2 +4x+4, (x+3)^2 - x^2+6x+9, (x+4)^2 - x^2+8x+16, (x+5)^2 - x^2+10x+25, (x+6)^2 - x^2+12x+36, (2x-1)^2 - 4x^2-4x+1, (3-x)^2 - x^2-6x+9,

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