Hello everyone. Im having problems solving these type of questions. I have worked one out as clearly as I could and i would like someone to check my work and tell me where i went wrong. Thank you.

F(x,y,z) =x^{2}z^{2}i - 4yj + 2xyzk

S:x = 0,x =a,y = 0,y =a,z = 0,z =a