bonsoir
( x + 1 )² = - 2 x - 2
x² + 2 x + 1 = - 2 x - 2
x² + 2 x + 2 x = - 2 - 1
x² + 4 x = - 3
x² + 4 x + 3 = 0
( x + 3 ) ( x + 1 ) = 0
x = - 3 ou - 1
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bonsoir
( x + 1 )² = - 2 x - 2
x² + 2 x + 1 = - 2 x - 2
x² + 2 x + 2 x = - 2 - 1
x² + 4 x = - 3
x² + 4 x + 3 = 0
( x + 3 ) ( x + 1 ) = 0
x = - 3 ou - 1