• a. 2x-5<3x+7
    2x < 3x + 7 + 5
    2x - 3x < 12
    -x < 12
    x > -12
     
    b. x²-x+1>x(x+3)
    x²-x+1 > x² + 3x
    x²-x+1 - x² - 3x > 0
    -4x + 1 > 0
    4x < 1
    x < 1/4

    c. (x-1)(x+2)<x²-x
    x² + 2x - x - 2 - x² + x < 0
    2x - 2 < 0
    2x < 2
    x < 2/2
    x < 1

    En espérant t'avoir aidé.

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