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m01 qs 12-PLS help

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Manager
Manager
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Joined: 05 Mar 2011
Posts: 155
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Kudos [?]: 8 [0], given: 3

m01 qs 12-PLS help [#permalink] New post 25 Dec 2011, 11:58
What is the value of (p^3) - (q^3)?
1. p-q = 0
2. p + q = 0


I dont get it -i picked c
The reason why I dont think 1 is suff is cause

p-q=0

p=2,q= 2
2-2=0

now take p=-2 and q=-2
-2- (-2)
-2+2=0

therefore a isnt suff
b also is not suff
p=2,q=-2 or p=-2,q=2

combined they are suff
Senior Manager
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Joined: 18 Sep 2009
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Kudos [?]: 90 [0], given: 2

Re: m01 qs 12-PLS help [#permalink] New post 26 Dec 2011, 08:01
stmnt1) p-q=0
so p=q.
p=2,q=2
(2.2.2)-(2.2.2)=8-8=0
p=-2,q=-2
(-2.-2.-2)-(-2.-2.-2)=(-8)-(-8)=-8+8=0
stmnt always yields 0 as reult,so it is sufficient
Re: m01 qs 12-PLS help   [#permalink] 26 Dec 2011, 08:01
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m01 qs 12-PLS help

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