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Sagot :

Bonjour

(2x + 1)² = 9

(2x + 1)² - 9 = 0

(2x + 1 - 3) (2x + 1 + 3) = 0

(2x - 2) (2x + 4) = 0

2x - 2 = 0             ou             2x + 4 = 0

2x = 2                                    2x = - 4

x = 2/2 = 1                              x = - 4/2 = - 2.

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