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georgekirby37 georgekirby37
  • 14-10-2014
  • Mathematics
Answered

Simplify 9 log9 (7) is the answer 7

Verified Answer :

kate200468
kate200468 kate200468
  • 14-10-2014

\(log_ab=c\ \ \ \Leftrightarrow\ \ \ a^c=b\\\\log_97=x\ \ \ \Leftrightarrow\ \ \ 9^x=7\\\\9^x=7\ \ \ (and \ \ \ x=log_97)\ \ \ \Rightarrow\ \ \ 9^{\big{log_97}}=7\)

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