Algebra / Exponent Problem

BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

pkw209: Master | Next Rank: 500 Posts; Posts: 266; Joined: Mon Oct 19, 2009 9:46 pm; Thanked: 8 times; GMAT Score:690

by pkw209 » Thu Apr 15, 2010 12:08 pm

Figure this one out by plugging in numbers. Could someone provide an algebraic solution? Thanks!

Source: Beat The GMAT — Problem Solving | Thu Apr 15, 2010 12:08 pm

kevincanspain: GMAT Instructor; Posts: 613; Joined: Thu Mar 22, 2007 6:17 am; Location: madrid; Thanked: 171 times; Followed by:64 members; GMAT Score:790

by kevincanspain » Thu Apr 15, 2010 1:40 pm

Factor: ( x^-n)(1 - 1/x) = (x^-n)(x - 1)/x =( x^-(n+1))(x - 1)

Kevin Armstrong
GMAT Instructor
Gmatclasses
Madrid

• Page 1 of 1