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E(x)= (x+5)la patrat+2(x-4)(x+5)+(x-4)la patra

Răspuns :

x²+10x+25+2(x²+5x-4x-20)+x²-8x+16
x²+10x+25+2x²+2x-40+x²-8x+16
4x²+4x+31