A trinomial can be a perfect square if it satisfies the following:

The first term is a perfect square.

The third term is a perfect square.

The middle term is either or times the product of the square root of the first term and the square root of the third term.

The polynomial does not satisfy all qualifiers for being a perfect square.

The polynomial is not a perfect square

Determine if the Expression is a Perfect Square 9x-16y