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Efectuati: (6X-1)(3X+5).

Răspuns :

18x²+30x-3x+5=6x(3x+5)-1(3x+5)=(3x+5)(6x-1);
Deci (6x-1)(3x+5)=18x²+30x-3x+5=18x²+27x+5=x(18x+27)+5