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## Homework Statement

**2. The attempt at a solution**

So part a. makes sense to me, it basically comes down to

A1 =

1 -1 -1

-1 1 1

-1 1 1

A2 =

1 -1 -1

-1 2 -2

-1 -2 11

I'm not sure how to approach part b. because the question doesn't make much sense to me. It's asking to show that f1 is a single perfect square, so my guess is that from A1 I have to derive an expression for f1 that is a single perfect square.

Haven't really looked to hard at part c, yet.