Mathématiques

Question

bonjour, j ai besoin d aide merci!!!!
bonjour, j ai besoin d aide merci!!!!

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1 Réponse

  • 1) x-2(3x-8)=0 x-6x-16 = 0
    5x = 16
    x = 16/5

    2) (x-2)+(3x-8) = 0
    x²+4-4+3x²+48+64 = 0
    4x²+112 = 0
    4x² = -112
    2x = -112
    x = -56

    3) (x-2)(3x-8) = 0
    3x²+8x-6x+16 = 0
    3x²+2x = -16
    3/2x+2x = -16
    7/2x = -16
    x = -(32/7)

    4) (x-2)(3x-8) = 16
    3x²+2x = 0
    7/2x = 0
    x = 0

    5) (x-2)(3x-8) = -14
    3x²+2x = -30
    7/2x = -30
     x = -(60/7) 

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