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Sagot :

AYUDA

3x + 9 = 0

3x + 9 - 9 = 0 - 9

3x = -9

3x/3 = -9/3

x = - 3

-2x = 7

-2x/(-2) = 7/(-2)

x = -7/2

x = -3,5

et

2x + 1 > 0

2x > - 1

x > -1/2

x € ] - 1/2 ; + inf [

AENEAS

Bonjour,

On a :

a) 3x + 9 = 0

Donc 3x = -9

x = -9/3

x = -3

b) -2x = 7

x = 7/-2

x = -7/2

c) 2x+1 > 0

2x > -1

x > -1/2

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