Am I Right?

[TYSONG]

Suppose that a demand function is given by

where q is the demand for a product and p is the price per unit in dollars. Find the rate of change in the demand for the product per unit change in price.


For my answer I am getting

 

[stapel]

I'm getting something rather different.

Please reply showing your steps.

Thank you.

Eliz.

 

[TYSONG]