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2014-07-24T15:42:33+05:30

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Take logarithms to base 10  on both sides,
log X =   log 20²  - log 18  - log 9.8    =  2 log 20 - log 18 - log 9.8
         = 2 (log 2 + log 10) - (log 2 + 2 log 3 ) - ( 2  log 7 - log 10 + log 2)
         = 2 log 2 + 2 * 1 - log 2 - 2 log 3 - 2 log 7 +  2 * 1 - 2 * log 2
  simplify by substituting log 2 , log 3 , log  7 from log book.
find  inverse log after .

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