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Master | Next Rank: 500 Posts
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by Mclaughlin » Sat Aug 09, 2008 5:12 pm
what is the value of X

1. x^2 - 9 = 16
2. 3x(x-5) = 0

OA is C but I got B because I solved B and got a value for X.
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Source: — Data Sufficiency |
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by sibbineni » Sun Aug 10, 2008 8:09 pm
st1. x^2 - 9 = 16

x^2=25

x=+/-5 insuff
st2. 3x(x-5) = 0

3x=0 or (x-5)=0

x=0 or x=5

insuff


together(1) and (2)

x=5

sufficient
IMOC
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by pepeprepa » Mon Aug 11, 2008 3:06 am
You cannot find an unique value of X with 2) only. Check your error.
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