descompuneti in factori:
(4x-5)²- (3x)²=


Răspuns :

(4x-5) la puterea a doua - (3x) la puterea a doua =(4x-5-3x)(4x-5+3x)=(x-5)(7x-5)
 =  (4x-5-3x) x (4x-5+3x)=(x-5) x (7x-5)