Hi,

3^(4x-1)=3^31  ⇒ 4x-1 = 31   and   x = 8 

Answer by sachi(548)   (Show Source): You can put this solution on YOUR website!
 3^(4x-1)=3^31

or 4x-1=31    (a^x=a^y => x=y as the bases are same so the powers should be same)

or 4x=31+1=32

or x=32/4=8

ans 

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