Answer
$$18, \quad -5.$$
Work Step by Step
Since $ f(x,y)=x+yx^3$, then
$$ f(2,2)=2+(2)(2)^3=2+16=18.$$
$$ f(-1,4)=-1+4(-1)^3=-1-4=-5.$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 15 - Differentiation in Several Variables - 15.1 Functions of Two or More Variables - Exercises - Page 763: 1
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