Variable q8L, q8y, q8x,q8f must be of siize [6,1] it is currently of size [8,1]

syms x y L
f(x,y)=(x*y)^2;
g(x,y)=x^2+y^2-16;
firstpart=jacobian(f(x,y),[x,y])-L*jacobian(g(x,y),[x,y])

firstpart = 

[q8L,q8x,q8y]=solve([firstpart,g])

q8L = 

q8x = 

q8y = 

q8f=subs(f(x,y),{x,y},{q8x,q8y})

q8f = 

[lateef]

what does the error message im receiving mean how do i make it of [6,1]

[Torsten]

If would help if we knew the wording of your assignment.

[lateef]

the question for this problem states to use lagrange multipliers to find the maximum and minimum values of f(x,y)=xy^2 subject to the constraint x^2+y^2=16. Assign the second to last line to [q8L,q8x,q8y] and the last line to q8f.

thats the questions and i believe i computed the right code but the error message i get is listed above

[lateef]

if anyone can let me know how to fix this eror im getting id appreciate it thank you

[Torsten]

f(x,y)=x*y^2;

instead of

f(x,y)=(x*y)^2;

?