Find E(x) = - (x * D'(x)) / D(x)
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Find E(x) = - (x * D'(x)) / D(x)

[From: ] [author: ] [Date: 12-04-03] [Hit: ]
......
q = D(x) = √ (300-2x)
D'(x) = -1 / √ (300-2x)

right?
So

E(x) = - (x * D'(x)) / D(x) = - x * x (-1/ √ (300-2x)) / √ (300-2x)
= x / √ (300-2x)

right?

-
E(x) = - x*( -1 / √ (300-2x))/(√ (300-2x)) = x/(300 - 2*x), answer!
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keywords: 039,Find,Find E(x) = - (x * D'(x)) / D(x)
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