Matematika

Pertanyaan

Ada yg bisa?
(x - 5)^{3x²+4x+3} = (x - 5)^{x²+x-5}

1 Jawaban

  • [tex] (x - 5)^{3x^2+4x+3} = (x - 5)^{x^2+x-5}[/tex]
    Berbentuk
    [tex]h(x)^{f(x)}=h(x)^{g(x)} [/tex]

    Split into 4 possibilities

    [1.]
    x - 5 = 0
    x = 5

    Subtitusi ke f(x) dan g(x)
    ∴ 3(5)² + 4(5) + 3 > 0 [memenuhi]
    ∴ (5)² + 5 - 5 > 0 [memenuhi]

    [2.]
    x - 5 = 1
    x = 6

    [3.]
    x - 5 = -1
    x = 4

    Subtitusi ke f(x) dan g(x)
    ∴ 3(4)² + 4(4) + 3 = 67[ganjil]
    ∴ (4)² + 4 - 5 =15[ganjil]

    [4.]
    3x²+4x+3 = x² + x - 5
    2x² + 3x + 8 = 0

    >a = 2 , b = 3 , c = 8<

    D = b² - 4ac
    =>3² - 4(2)(8)
    =>-55 < 0
    x ∉ R

    HP : { 5 , 6 , 4 }

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