Hello! I just want to make sure I got this question right because I'm not quite sure if I did. Below is the question and then my work

" D J u f ( X, y ) = D U C D u f ( x , y ) ] V = . D u f ( x , y ) : D J [ D v f ( x , y ) J 5 7 8 > . ( 20 + 20 , 20 - 18 ) 3 > . [ . ] 3 18 ) . [ 28 ] ISThe second directional derivative of f(x, y) is Daf(x, y) = Du[Duf(x, y)]. If f(x, y) = 2x3 + 5x2y- 5y' and u =, calculate Daf(2, 1)