Homework Help: Calculus

Posted by Sarah on Sunday, December 9, 2007 at 10:30pm.

For the demand function find the elasticity function.
Problem 52.
p=D(x)=18-Sqrt[x]

My answer is [-36x^1/2 + 2x]/x

However, the answer in book is [-2(18-x^1/2)]/[x^1/2]

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