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10 January, 13:16

Solving Exponential Equations (lacking a common base)

4^x-5=8

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Answers (1)
  1. 10 January, 16:17
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    x = 6 1/2 or 6.5

    Step-by-step explanation:

    4^x-5 = 8

    2^2 (x-5) = 2^3

    since the base is equal, the powers are equal

    2 (x-5) = 3

    2x - 10 = 3

    2x = 3 + 10

    2x = 13

    2x/2 = 13/2

    x = 6 1/2 or 6.5
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