Answers

  • qais
  • Content Quality
2016-01-31T07:16:27+05:30
5^(2x-1) -100 = 25^(x-1)
5^(2x-1) - 100 = 5^2(x-1) =5^(2x-2)
consider 5^2x be a,then
⇒a×5^(-1) -100 = a×5^(-2)
⇒a/5 -100 =a/25
⇒4a/25 =100
⇒a =625
now, 5^2x =625 =5^4
equating the powers, 
2x= 4
⇒x =2
so, 6^2 = 36

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