Value of z

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Abdulla: Master | Next Rank: 500 Posts; Posts: 328; Joined: Thu Aug 07, 2008 5:25 pm; Location: Philadelphia; Thanked: 4 times; GMAT Score:550

by Abdulla » Sat Nov 21, 2009 3:23 pm

OA is B

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Source: Beat The GMAT — Problem Solving | Sat Nov 21, 2009 3:23 pm

papgust: Community Manager; Posts: 1537; Joined: Mon Aug 10, 2009 6:10 pmFollowed by: 252 members; Thanked: 653 times

by papgust » Sun Nov 22, 2009 2:46 am

z = root(6zs - 9s^2)

Square both sides,

z^2 = 6zs - 9s^2

z^2 - 6zs + 9s^2 = 0

This is nothing but,

(z-3s)^2 = 0

z = 3s (B)

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