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Sagot :

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bonjour

x³ + x² - 2 x = 0

x ( x² + x - 2 ) = 0

x² + x - 2 = 0

Δ =  ( - 1 )² - 4 ( 1 * - 2 ) = 1 + 8 = 9

x 1 = ( - 1 - 3 ) / 2 = - 4 /2 = - 2

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

S { - 2 ; 0 ; 1 }

essaie de faire l'autre

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