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Explications étape par étape

(x + 8)(x - 5) = 0

x + 8 = 0 ou x - 5 = 0

x = -8 ou x = 5

5x(4 - x) = 0

5x = 0 ou 4 - x = 0

x = 0 ou x = 4

(x + 3)^2 = 0

x + 3 = 0

x = -3