powers question

sudhir3127: Legendary Member; Posts: 829; Joined: Mon Jul 07, 2008 10:09 pm; Location: INDIA; Thanked: 84 times; Followed by:3 members

Re: powers question

by sudhir3127 » Fri Sep 12, 2008 10:15 am

nevy wrote:how to solve this plz:

3^x - 3^(x-1)= 162

what is the value of x?

take 3^x as common

3^x( 1-1/3) = 162

3^x ( 2/3) = 162

3^x = 162*3/2

3^x = 81*3

3^x = 3^5

x = 5

hope this helps....

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