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16 August, 01:43

If 3^2x+1=81, what is the value of x?

x=1/4

x=1/2

x=3/2

x=2/3

+2
Answers (1)
  1. 16 August, 05:12
    0
    3^ (2x+1) = 81

    3^ (something) = 81

    3^4=81. I know this because 3X3X3X3=81

    If I know 3^4=81, then I need to find a solution to get 4 for my exponent.

    Let's solve.

    2x+1=4

    2x=3

    x=3/2
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