what is x?
logx^81 = 4

• @ Arun,
  Pls check.
  your solution is correct if statement is
  logx81 = 4 ...
  
  logx81=4
  as
  logxa=k if a= x^k
  if 'a' can be written as k th power of x then we say k is logarithm of a to base x.
  
• 10 years agoHelpfull: Yes(1) No(0)
• logx^81=4
  => x^4=81
  => x^4=3^4
  => x=3
• 10 years agoHelpfull: Yes(0) No(1)
• @ SUMAN
  hmm.. you r right. Its a mistake by me
  
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• logx^81=4
  10^4=x^81
  10^(4*1/81)=x^(81*1/81)
  x=10^(4/81)
• 10 years agoHelpfull: Yes(0) No(0)