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Sagot :

JPMORIN3

bjr

x² + 14x + 48 = 0

x² + 14x + 49 - 1 = 0

(x + 7)² - 1 = 0               on factorise a² - b² = ...

(x + 7  - 1)(x + 7 + 1) = 0

(x + 6)(x + 8) = 0                  équation produit nul

x + 6 = 0   ou   x + 8 = 0

x = -6 ou x = -8

S = {-8 ; -6}

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