Question

ould I get some help with this question please:)

Demand function
128
------ +2
x^2

Quality demand x = 4

Find the price elasticity of demand for the demand function at the indicated x-value.

Answer 1

I don't know how can I put this in P/X/DP/DX form

Answer 2

or (P/X)/DP/DX) form

Answer 3

I can figure out once is in (P/X)/(DP/DX) form

Answer 4

my last problem I got - 109/200