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Atenaszabop0g2iv
a fost răspuns

rezolva : E(x)=(x+5)^2+2(x+5)(x-2)+(x-2)^2

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+2x²-4x+10x-20+x²-4x+4
E(x)=4x²+12x+9
E(x)=(2x+3)²

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