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x²+10x+25=(x+5)²
(4x+11)²=
x²+8x+16=(x+4)
x[do pot. 2] + 10x +25=(x+5)²
(3x-5)=9x²-30x+25
(x+3)(x-3)=x²+9
(2x+5)=4x²+20x+25
(7+3x)=49+42x+9x²