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(x+2) la patrat + (x-1 )la patrat

Răspuns :

[tex](x+2)^{2} +(x-1)^{2}= x^{2} +4x+2^{2}+ x^{2} -2x-1^{2}= 2x^{2}+2x+3 [/tex]
x la pătrat +2×x×2+2 la patrat + x la patrat - 2×x×1+ 1 la patrat = x la patrat +4x+4+x la patrat - 2x+ 1