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17 March, 02:11

Solve 3^x - 2 = 3^7

A. 2

B. 5

C. 7

D. 9

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Answers (1)
  1. 17 March, 02:33
    0
    C) 7

    Step-by-step explanation:

    3^x-2=2187

    Step 1: Add 2 to both sides.

    3^x-2+2=2187+2

    3^x=2189

    Step 2: Solve Exponent.

    3^x=2189

    log (3x) = log (2189) <
    x * (log (3)) = log (2189)

    x = log (2189) / log (3)

    x=7.000832
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