Matematika

Pertanyaan

diketahui f(x)= ax+b. jika f(-1) =4 dan f(-3) =-14, maka f(-2) adalah

1 Jawaban

  • f (x) = ax + b

    f (-1) = -1a + b = 4
    f (-3) = -3a + b = -14

    (-1a - (-3a)) = 4 - (-14)
    (-1a + 3a) = 4 + 14
    2a = 18
    a = 18 / 2
    a = 9

    -1a + b = 4
    -1•(9) + b = 4
    - 9 + b= 4
    b = 4 + 9
    b = 13

    karena f(x) = ax + b
    maka f (-2) = 9 • (-2) + 13
    = - 18 + 13
    = -5

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