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E(x)=(x+3) la patrat + 2(x-4)(x+3) + (x-4) la patrat

Răspuns :

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Vezi imaginea PESTEGRAS
E (x)=X la patrat+6x+9+(2x-8)(x+3)+x la patrat-8x+16 =x la patrat+6x+9+2x la patrat-6x+8x-24+x la patrat-8x+16 =4x patrat+1=> => E (x)=4x la patrat+1