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Sagot :

VINS

bonsoir

x

x²+ 3 x

x² + 3 x + 2

si on prend 1 = 1 ² + 3 *1 + 2 = 1 + 3 + 2 = 6

si on prend - 5 = ( - 5 )² + 3 *-5 + 2 = 25 - 15 + 2 = 12

( x + 2 ) ( x + 1 ) = x² + x + 2 x + 2 = x² + 3 x + 2

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

x = - 2 ou - 1

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