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oustone85: Junior | Next Rank: 30 Posts; Posts: 11; Joined: Mon Apr 21, 2008 5:57 pm

by oustone85 » Wed May 28, 2008 9:10 am

(5^18 - 5^8) / (5^9 - 5^4)

Not sure how to solve for this. Any feedback is appreciated. Thanks in advance.[/u]

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Source: Beat The GMAT — Problem Solving | Wed May 28, 2008 9:10 am

chidcguy: Master | Next Rank: 500 Posts; Posts: 438; Joined: Mon Feb 12, 2007 9:44 am; Thanked: 26 times

by chidcguy » Wed May 28, 2008 9:16 am

(5^18 - 5^8) = (5^9 + 5^4) (5^9 -5 ^4)

So the answer is (5^9 + 5^4)

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