Question: Let f ( x , y , z ) = ( 3 x ^ 3 + 3 yz ^ 3 + 3 xy ^ 3

Let f (x, y, z)=(3x^3+3yz^3+3xy^3). Find f (-2,1,1).
A
28
B
-27
C
18
D
-28
E
-1

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