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Sagot :

Bonsoir, voici mes raiponces.

Réponse :

a) x = 14/3

b) x = -14/3

c) x = -4/3 où x = 7

d) x = 1/7

e) x = racine carré de 11  

f) x = 6/5 où x = 0

g) x = -20/9

Explications étape par étape

a)

3x - 9 = 5

3x = 5 + 9

3x = 14

x = 14/3

b)

7(2x - 4) = 20x

14x - 28 = 20x

14x - 20x = 28

-6x = 28

-x = 28/6

x = -28/6

x = -14/3

c)

(7 - x ) (3x + 4) = 0

x = -4/3 où x = 7

d)

2x + 3 = -5x + 4

2x + 5x = 4 - 3

7x = 1

x = 1/7

e)

4x² = 44

x² = 44/4

x = racine carré de 44/4

x = racine carré de 11  

f)

2x (5x -6) = 0

x = 6/5 où x = 0

g)

-x - 7 = 8x + 13

-x - 8x = 13 + 7

-9x = 20

-x = 20/9

x = -20/9

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