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(x+3)²-25 descompuneti in produs de factori

Răspuns :

(x+3)²-5²=(x+3-5)(x+3+5)
=(x-2)(x+8)
Rezolvare:
(x + 3)² - 25 =
= x² + 6x + 9 - 25 = 
= x² + 6x - 16 =
= x² -2x + 8x - 16 =
= x(x - 2) + 8(x - 2) =
 = (x - 2)(x + 8)