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Descompuneti folosind formula diferentei de patrate:

[tex](5x+3)^{2} -(x+2)^{2}[/tex]


Răspuns :

folosim a² - b² = (a - b)(a + b)

5x + 3 = a

x + 2 = b

(5x + 3)² - (x + 2)² =

= (5x + 3 - x - 2)(5x + 3 + x + 2)

= (4x + 1)(6x + 5)