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ddm: Master | Next Rank: 500 Posts; Posts: 162; Joined: Mon Jul 28, 2008 8:33 pm; Location: San Jose,CA; Thanked: 1 times

by ddm » Fri Aug 29, 2008 2:48 pm

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Source: Beat The GMAT — Problem Solving | Fri Aug 29, 2008 2:48 pm

parallel_chase: Legendary Member; Posts: 1153; Joined: Wed Jun 20, 2007 6:21 amFollowed by: 2 members; Thanked: 146 times

Re: #p#

by parallel_chase » Fri Aug 29, 2008 3:59 pm

ddm wrote:attachment

#p#=ap^3 + bp -1

#-7#= -343a - 7b -1

-343a - 7b -1 = 3

343a + 7b +1 = -3

343a + 7b = -4

#7# = 343a + 7b -1

#7# = -4 -1 = -5

Hope this helps.

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