x again

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success1111: Senior | Next Rank: 100 Posts; Posts: 87; Joined: Sun Apr 19, 2009 11:07 pm

by success1111 » Wed May 13, 2009 8:34 am

If 25(5^x)=1 then x=
A. –2
B. –1
C. 0
D. 1
E. 2

Trust but verify.

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Source: Beat The GMAT — Problem Solving | Wed May 13, 2009 8:34 am

Vemuri: Legendary Member; Posts: 682; Joined: Fri Jan 16, 2009 2:40 amFollowed by: 1 member; Thanked: 32 times

Re: x again

by Vemuri » Wed May 13, 2009 8:37 am

IMO A

5^x = 5^(-2)
Hence, x=-2

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success1111: Senior | Next Rank: 100 Posts; Posts: 87; Joined: Sun Apr 19, 2009 11:07 pm

Re: x again

by success1111 » Wed May 13, 2009 9:08 am

Vemuri wrote:IMO A

5^x = 5^(-2)
Hence, x=-2

Thanks. OA is A. i got it after made silly mistake initially.

Trust but verify.

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