I believe that the answer is about 11 square feet because when you divide 16 by 1.5, you get 10.666666667, and most likely they won't be accepting an answer like that. So, you round to the nearest square feet and you get 11.
if x=2 ⇒ f(x)=y=0 ⇒ graph of f(x) intercept x axis in (2,0) if x=4 ⇒ f(x)=y=0 ⇒ graph of f(x) intercept x axis in (4,0) if x=0 ⇒f(x)= -2 *(-2)*(-4)= - 16 ⇒ graph of f(x) intercept y axis in (0,- 16)
