Absolutely not! gives y= 0.

(6)

Now, add in (4),(5), and (6) for the constraint

then

So, at this point i am stuck. I don't know how to finish.

I don't even know if i was suppose to use Lagrange multiplier or if its correct up to that point?

If someone could let me know if i did the problem correctly and help me finish?

Thank you so much.