Réponse :
bonjour
4 x - 5 = 3
4 x = 3 + 5
4 x = 8
x = 2
3 x - 1 = x - 3
3 x - x = - 3 + 1
2 x = - 2
x = - 1
8 x + 10 - 2 x = 6 x - 12
6 x - 6 x = - 12 - 10
0 x = - 22
pas de solution
5 x - 10 x + 5 = 3 - 4 x - x + 8
- 5 x + 5 x = 11 - 5
0 x = 6
pas de solution
2 x + 5 + 6 x + 27 = 0
8 x = - 27 - 5
8 x = - 32
x = - 4
( 3 x + 1 ) / 2 = 2 x + 1
( 3 x + 1 ) / 2 = ( 4 x + 2 ) /2
3 x + 1 = 4 x + 2
3 x - 4 x = 2 - 1
- x = 1
x = - 1
( x - 5 ) / 2 = ( 2 x + 3 ) / 5
( 5 x - 25 ) /10 = ( 4 x + 6 ) / 10
5 x - 25 = 4 x + 6
5 x - 4 x = 6 + 25
x = 31
fais la suite, même chose et = révisions
F = ( 2 x + 5 )² - x ( 2 x + 5 )
F = 4 x² + 20 x + 25 - 2 x² - 5 x
F = 2 x² + 15 x + 25
F= ( 2 x + 5 ) ( 2 x + 5 - x )
= ( 2 x + 5 ) ( x + 5 )
F = 0 pour x = - 5/2 ou - 5
2 x² + x - 3 = 0
Δ = 1 ² - 4 ( 2 * - 3 ) = 1 + 24 = 25
x 1 = ( - 1 - 5 ) / 4 = - 6 /4 = - 3 /2
x 2 = ( - 1 + 5 ) / 4 = 4/4 = 1
( 3 x + 8 ) ( x - 2 ) = 3 x² - 6 x + 8 x - 16 = 3 x² + 2 x - 16
( 3 x + 8 ) ( x - 2 ) = 0
x = - 8/3 ou 2
Explications étape par étape :
