Respuesta :

chasitygreen55

Answer:2-b= 18-a+b now their product is F=a.b-f(b)=18+b)b Dt/db =18+2b-0=18+2b-0=9+b-9=b

so, that's our only critical point, run a first-derivative test on it, and you'll notice is a minimum

Step-by-step explanation: