bonjour
3 ( x + 5 ) + x ( x + 5 ) = 0
3 x + 15 + x² + 5 x = 0
x² + 8 x = - 15 x² + 8 x + 15 = 0
( x + 2 ) ( x + 3 ) = 0
x = - 2 ou - 3
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bonjour
3 ( x + 5 ) + x ( x + 5 ) = 0
3 x + 15 + x² + 5 x = 0
x² + 8 x = - 15
x² + 8 x + 15 = 0
( x + 2 ) ( x + 3 ) = 0
x = - 2 ou - 3