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descompuneti in factori :

9x la 2 - (3x-2) la 2


Răspuns :

(3x)² - (3x-2)² = [3x-(3x-2)] * [3x+(3x-2)]= 
=(3x-3x+2) * (3x+3x-2)= 2*( 6x-2 ) = 2*2(3x-1) = 4(3x-1)