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# Help needed with constrained optimisation watch

1. I understand the Lagrange method, but seem to end up with b=a. How do I gain a solution from this and work out whether it's a min??

Here's the question : Solve the following optimising problem:
min ax^2 + by^2subject to x + y = 1. Check it is a minimum. Specify any condition(s) on aand b that need to hold.

Any help appreciated, Thanks
2. (Original post by Shazzy69)
I understand the Lagrange method, but seem to end up with b=a. How do I gain a solution from this and work out whether it's a min??

Here's the question : Solve the following optimising problem:
min ax^2 + by^2subject to x + y = 1. Check it is a minimum. Specify any condition(s) on aand b that need to hold.

Any help appreciated, Thanks
3. Here:
4. (Original post by Shazzy69)
Here:

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