Find the exact value of the logarithm without using a calcul
     Find the exact value of the logarithm without using a calculator. log_1/5^652 log_1/5 625 =  (Type an integer or a simplified fraction.) 
  
  Solution
since 625 = 54 = (1/5)-4
log1/5(625) = log1/5(1/5)-4
since log(an)=nlog(a)
log1/5(625) = -4 log1/5(1/5)
since loga(a)=1
log1/5(625) = -4 (1)
log1/5(625) = -4

