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19 March, 10:24

5^ (2x) - 3*5^x = 18 find using natural logs

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Answers (2)
  1. 19 March, 12:04
    0
    Yes because 5^ (2x) is 18/34
  2. 19 March, 12:28
    0
    Step-by-step explanation:

    hello:

    let : 5^x = t ... t > 0

    note : 5^ (2x) = (5^x) ²

    you have : t²-3t-18=0

    (t-6) (t+3) = 0

    t-6=0 or t+3=0

    t = 6 or t = - 3 (refused)

    but : 5^x = t so : 5^x = 6

    using natural logs : log (5^x) = log6

    x log5 = log6

    x = log6/log5
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