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a fost răspuns

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

Răspuns :

E(x)=(x+5)²+2(x+5)(x-2)+(x-2)²

E(x)=(x²+10x+25)+2(x²-2x+5x-10)+(x²-4x+4)

E(x)=x²+10x+25+2x²+6x-20+x²-4x-4

E(x)=4x²+12x+1