Sagot :
Réponse :
bonsoir
1 ) ( 2 + x ) ( 3 x - 1 + 5 ) = 0
( 2 + x ) ( 3 x + 4 ) = 0
x = - 2 ou - 4/3
2) ( 1 + x ) ² - ( 1 + x ) ( x + 2 ) = 0
( 1 + x ) ( 1 + x - x - 2 ) = 0
( 1 + x ) ( - 1 ) = 0
x = - 1
( 1 + 2 x)² - 9 = 0
( 1 + 2 x - 3 ) ( 1 + 2 x + 3 ) = 0
( 2 x - 2 ) ( 2 x + 4 ) = 0
x = 1 ou - 2
Explications étape par étape
Bonjour
[tex]1.(2 + x)(3x - 1) + 5(2 + x) = 0 \\ (2 + x) \times (3x - 1 + 5) = 0 \\ (2 + x) \times (3x - 4) = 0 \\ 2 + x = 0 \\ 3x + 4 = 0 \\x = - 2 \\ x = - \frac { 4}{3} \\ [/tex]
2.(1+x)2- (1+x) (x+2) = 0 (1+x)(1+ x x - 2) = 0 (1+x) (-1) = 0
x = -1
3.(1 + 2 x)2 - 9 = 0
(1+2 x- 3)(1+2 x + 3) = 0 (2 x-2)(2x + 4) = 0
x= 1