X2–10X+25 - ( X - 5 ) ( X - 5 ), 25x2+30x+9 - ( 5x + 3 )( 5x + 3 ), 121x2-88xy+16y2 - ( 11x - 4y )( 11x - 4y ), X2+15X+26 - ( x+2 )( x+13 ), x2+4x-21 - ( x + 7 ) ( x - 3 ), x2+9x+20 - ( x + 4 ) ( x + 5 ), x2+14x+13 - ( x + 13 ) ( x + 1 ), x2-2x-15 - ( x - 5 ) ( x + 3 ),

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