👤

Descompuneti: (3x-1) ori (3x +1 )=

Răspuns :

(3x-1)•(3x+1)=(3x)²-1²=9x²-1
[tex](3x-1)(3x+1) = 9 x^{2} -3x-1+3x. \\ se\ simplifica\ -3x\ cu\ 3x\ (numere\ opuse,\ adunate\ dau\ 0) \.\ ramane : \\ (3x-1)(3x+1)=9x^{2} -1.[/tex]