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= {(2x+5)(2x+5)} - {(x-3)(x-3)}
= (4x²+10x+10x+25) - (x²-3x-3x-9)
= (4x²+20x+25) - (x²-6x-9)
= 4x²+20x+25-x²+6x+9
= 4x²-x²+20x+6x+25+9
= 5x²+26x+34