Matematika

Pertanyaan

jika x1/2 + x-1/2 = 2 maka nilai x2 + x-2 adalah

1 Jawaban

  • @
    x^(1/2) + x^(-1/2)  = 2
    { x^(1/2) + x^(-1/2) }^2 = 2^2
    x + 2. x^(1/2). x^(-1/2) + x^-1  = 4
    x +  2. x^0 + x^-1 = 4
    x + 2 + x^-1 = 4
    x + x^-1 = 4-2
    x + x^-1 = 2

    (x + x^-1)^2 = 2^2
    x^2 + 2 .x. x^-1  + x^-2 = 4
    x^2 + 2 x^0 + x^-2 = 4
    x^2 + 2 + x^-2 = 4
    x^2  + x^-2 = 4-2
    x^2 + x^-2 = 2
    (^=pangkat)

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