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27 April, 07:33

Solve:

(15/x) + (9x-7) / (x+2) = 9

+3
Answers (1)
  1. 27 April, 07:39
    0
    Answer:x=3

    Step-by-step explanation:

    D (x)

    x+2 = 0

    x = 0

    x+2 = 0

    x+2 = 0

    x+2 = 0 / / - 2

    x = - 2

    x = 0

    x = 0

    x in (-oo:-2) U (-2:0) U (0:+oo)

    (9*x-7) / (x+2) + 15/x = 9 / / - 9

    (9*x-7) / (x+2) + 15/x-9 = 0

    (x * (9*x-7)) / (x * (x+2)) + (15 * (x+2)) / (x * (x+2)) + (-9*x * (x+2)) / (x * (x+2)) = 0

    x * (9*x-7) + 15 * (x+2) - 9*x * (x+2) = 0

    9*x^2-9*x^2+8*x-18*x+30 = 0

    30-10*x = 0

    (30-10*x) / (x * (x+2)) = 0

    (30-10*x) / (x * (x+2)) = 0 / / * x * (x+2)

    30-10*x = 0

    30-10*x = 0 / / - 30

    -10*x = - 30 / / : - 10

    x = - 30 / (-10)

    x = 3

    x = 3
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