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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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