Matematika

Pertanyaan

bantu kk... :) thank's
bantu kk... :) thank's

2 Jawaban

  • Mapel : Matematika Peminatan
    Kelas : X SMA
    Materi : Persamaan Eksponen

    Pembahasan :
    6^(x + 2) = 36^(x + 2)
    6^(x + 2) = (6²)^(x + 2)
    6^(x + 2) = 6^(2x + 4)
    x + 2 = 2x + 4
    2x - x = 2 - 4
    x = -2

    Hp : {-2}

    ————————————————
    4^(x + 2) = 16^(x + 5)/4
    4^(x + 2) = (4²)^(x + 5)/4
    4^(x + 2) = 4^(x + 5)/2
    x + 2 = (x + 5)/2
    2x + 4 = x + 5
    2x - x = 5 - 4
    x = 1

    Hp : {1}

    ————————————————
    5^(x - 5)/2 = 1
    5^(x - 5)/2 = 5°
    (x - 5)/2 = 0
    x - 5 = 0
    x = 5

    Hp : {5}

    ————————————————
    (√10)^(x - 2) = 0,1
    (10^1/2)^(x - 2) = 10^(-1)
    10^(x - 2)/2 = 10^(-1)
    (x - 2)/2 = -1
    x - 2 = -2
    x = 0

    Hp : {0}

    ————————————————
    2^(x + 3)/2 = (1/4)^(x + 4)
    2^(x + 3)/2 = [2^(-2)]^(x + 4)
    2^(x + 3)/2 = 2^(-2x - 8)
    (x + 3)/2 = -2x - 8
    x + 3 = -4x - 16
    x + 4x = -16 - 3
    5x = -19
    x = -19/5

    Hp : {-19/5}
  • Bab Eksponensial
    Matematika SMP Kelas IX

    1] 6^(x + 2) = 36^(x + 2)
        6^(x + 2) = 6^(2 (x + 2))
        x + 2 = 2x + 4
        x - 2x = 4 - 2
        -x = 2
        x = -2

    2] 4^(x + 2) = ⁴√(16^(x + 5))
        4^(x + 2) = 4^(2(x + 5)/4)
        x + 2 = (x + 5)/2
        2 (x + 2) = x + 5
        2x + 4 = x + 5
        2x - x = 5 - 4
        x = 1

    3] √(5ˣ⁻⁵) = 1
        5^((x - 5)/2) = 5^0
         (x - 5)/2 = 0
         x - 5 = 2 . 0
         x = 0 + 5
         x = 5

    4] (√10)^(x - 2) = 0,1
        10^((x - 2)/2) = 10^(-1)
        (x - 2)/2 = - 1
        x - 2 = -1 . 2
        x = -2 + 2
        x = 0

    5] √(2^(x + 3)) = (1/4)^(x + 4)
        2^((x + 3)/2) = 2^(-2(x + 4))
        (x + 3)/2 = -2x - 8
        x + 3 = 2 (-2x - 8)
        x + 3 = -4x - 16
        x + 4x = -16 - 3
        5x = -19
        x = -19/5