## Calculus (3rd Edition)

$f(2,2) = 18$. $f(-1,4) =-5$.
We are given the function: $f(x,y)=x+yx^3$ We plug in the points to find the function values: $f(2,2) = 2+ 2(2)^3= 2+ 2(8) = 2+116=18$. $f(-1,4) = -1+ 4(-1)^3= -1+ 4(-1) = -1 -4= -5$.