Matematika

Pertanyaan


[tex]jika \: \: 3(x + 7) = x - 15 \\ nilai \: \: 4x - 2 \:adalah[/tex]

2 Jawaban


  • [tex]3(x + 7) = x - 15 \\ 3x + 21 = x - 15 \\ 3x - x = - 15 - 21 \\ 2x = - 36 \\ x = \frac{ - 36}{2} \\ x = - 18[/tex]
    maka
    [tex]4x - 2 = 4(18) - 2 = 72 - 2 = 70[/tex]
  • 3 (x+7) = x-15
    3x+21 = x-15
    3x-x = -15-21
    2x = -36
    x=-36/2
    x = -18

    4x - 2
    = 4 . -18 -2
    = -72 -2
    = -74

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