Matematika

Pertanyaan

Diketahui F(X)=ax+b. Jika F(4)=-2 dan F(-4)=6 nilai F(8) adalah

1 Jawaban

  • f(x) = ax + b
    f(4) = a(4) + b = - 2
    f(-3) = a(-4) + b = 6
    ..
    4a + b = - 2
    - 4a + b = 6
    --------------- --
    8a = - 8
    a = -8/8
    a = - 1

    4a + b = - 2
    4(-1) + b = - 2
    - 4 + b = - 2
    b = - 2 + 4
    b = 2

    f(x) = ax + b
    = - x + 2

    f(8) = - (8) + 2
    = -8 + 2
    = - 6

    jadi nilai f(8) = - 6

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