If f(x)=x-6 and g(x)=x1/2(x+3), find g(x) times f(x)

To solve this problem you must apply the proccedure shown below:
 1. You have the following functions given in the problem above:
  and 
 2. You have that g(x) times f(x) can be written as g(x)*f(x). Therefore, you must multiply f(x) * g(x), as following:
 
 3. Applying the distributive property, you have:
 
 
 The answer is:  

Ithink it would be 160 people