Prep for the GMAT : solve this exponential equation

[@Mathsup-jp4pm]

Prep for the GMAT : solve this exponential equation

[@مهديمعايش]

The result is-1

[@Mathsup-jp4pm]

Keep it up!

[@jakubkrcma]

My first guess is x = -1. Because 9^-1 is 1/9 and 1/9 + 1/9 + 1/9 = 1/3.

[@soaringhigh-v7m]

you can use logarithms to do this more easily 3*9^x=1/3 9^x=1/9 log_9(9^x)=log_9(1/9) x=-1

[@Mathsup-jp4pm]

You are right but some people preparing the GMAT don't know the log function!

[@joshix833]

9^x=1/9 Is pretty easy as one should know that x^-1=1/x

[@soaringhigh-v7m]

that's quite easy lol