Aidez moi svp ‍ <3 ❤​

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 :