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VAAA ROG ...ajutati-maaaaa !!!!!! :((


(x+5) la puterea 2 - (x+3) *(x-1) - (x-2) la puterea 2


Răspuns :

(x+5)² - (x+3)(x-1) - (x-2)² = 14x + 21 - x² - 2x + 3 = -x² +12x + 24
(x+5)² - (x-2)²  = (x+5+x-2)(x+5-x+2) = (2x+3)·7