Réponse :
Explications étape par étape :
bonjour
(x+3)² = x(x-2)
x² +6x + 9 = x² -2x
x²-x² +6x+2x = - 9
8x = -9
x = - 9/8
2/5 x + 8 = 1/3(x-7)
2/5 x + 8 = 1/3 x-7/3
2/5 x -1/3 x = -8 -7/3
x( 2/5 -1/3) = - 24/3 - 7/3
(1/15) x = - 31/3
x = - (31 *15 ) 3
x = - 465/3
x= - 155
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Réponse :
Explications étape par étape :
bonjour
(x+3)² = x(x-2)
x² +6x + 9 = x² -2x
x²-x² +6x+2x = - 9
8x = -9
x = - 9/8
2/5 x + 8 = 1/3(x-7)
2/5 x + 8 = 1/3 x-7/3
2/5 x -1/3 x = -8 -7/3
x( 2/5 -1/3) = - 24/3 - 7/3
(1/15) x = - 31/3
x = - (31 *15 ) 3
x = - 465/3
x= - 155