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Calculati: (x-1)(x+4)-(x-2)(x+2)

Răspuns :

(x-1)(x+4)-(x-2)(x+2)=x la puterea 2+4x-x-4-(x la puterea a doua-4)=x la putera a doua + 3x-4-x la putera a doua+4= 3x
x²-2·x·1+1² · x²+2·x·4+4²⁻x²⁻2²
x²⁻2x+1 ·x²+8x+14⁻x²⁻4
x²+6x+10