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Răspuns :

(2x-5)(2x-5)=4x la2-20x+25

(x-2)(x+2)=x la2-4

(x+4)(x+4)=x la2+8x+16

4x la2-20x+25+2x la2-12-x la2-8x-16=

5x la2-28x-3