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a fost răspuns

(x+3y+2)totul la patrat

Răspuns :

Trombolistul
(x+3y+2)²=

(x+3y+2)(x+3y+2)=

x(x+3y+2)+3y(x+3y+2)+2(x+3y+2)=

x²+3xy+2x+3y(x+3y+2)+2(x+3y+2)=

x²+3xy+2x+3yx+9y²+6y+2(x+3y+2)=

x²+3xy+2x+3yx+9y²+6y+2x+6y+4=

x²+(3xy+3xy)+(2x+2x)+9y²+(6y+6y)+4=

x²+6xy+4x+9y²+12y+4

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