Bonsoir, je ne comprends rien a mes maths, merci de bien vouloir m'aider sur ce, passez une bonne soirée

bonjour

( x + 3)  + ( x - 4) = 0

x + 3 + x - 4 = 0

2 x = 4 - 3

2 x = 1

x = 1/2

2 x² - 5 x = 0

x ( 2 x - 5 ) = 0

soit x = 0

soit 2 x - 5 = 0 et x = 5/2

( x + 1 ) ( x - 5 ) = 0

soit x + 1 = 0 et x = - 1

soit  x - 5 = 0 et x = 5

4 x² - 5 = 2 x ( 3 + 2 x )

4 x² - 5  = 6 x + 4 x²

4 x² - 4 x² - 6 x = 5

-  6 x = 5

x = - 5/6

( x + 1 ) ( x + 2 ) = 2

x² + 2 x + x + 2 = 2

x² + 3 x = 2 - 2

x² + 3 x = 0

x = 0

( 3 x - 5 )² = 0

( 3 x - 5 ) ( 3 x - 5) = 0

3 x - 5 = 0  donc  x = 5/3

Bonsoir,

a. ( x + 3) + ( x - 4) = 0

x + 3 + x - 4 = 0

2x = 4 - 3

2x = 1

x = 1/2

b. 2x² - 5x = 0

x ( 2x - 5 ) = 0

2x - 5 = 0

x = 5/2

c. ( x + 1 ) ( x - 5 ) = 0

x - 5 = 0

x = 5

d. 4x² - 5 = 2 x ( 3 + 2 x )

4 x² - 5  = 6x + 4 x²

4x² - 4x² - 6x = 5

- 6x = 5

x = - 5/6

e. ( x + 1 ) ( x + 2 ) = 2

x² + 2x + x + 2 = 2

x² + 3x = 2 - 2

x² + 3x = 0

x = 0

f. ( 3x - 5 )² = 0

( 3x - 5 ) ( 3x - 5) = 0

3x - 5 = 0  

x = 5/3