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