Mathématiques

Question

Résoudre chaque Equitation :

a) 3 (2x +5) = -7 (3 -2x)
b) 4 ( 2- 8x) - 3 (-9x + 1 ) = 0

2 Réponse


  • a)
    3 (2x +5) = -7 (3 -2x)
    6x +15 = -21 +14x
    6x -14x = -21 -15
    -8x = - 36
    x = 36 /8
    x= 18 /4
    x= 9/2


    b)
    4 ( 2- 8x) - 3 (-9x + 1 ) = 0

    8 - 32x  + 27x -3 =0
    - 5x  + 5 =0
    -5x = -5
    x = 5/5
    x=1

  • a)= 3(2x + 5) = -7(3-2x)

    a) 6x + 15 = -21 +14x

    a) 6x+15-15 = -21 + 14x -15

    a) 6x -14x= -21 -15 + 14x - 14x

    a) -8x = -36

    a) -8x/-8 = -36/-8

    a) x= 4.5

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