The first question is what are the signs: 2 pluses, 2 minuses or one of each which leaves just two answers.

The second question is how do we get 16x^2: is it (8x)(8x) or (4x)(4x)?

The first question is what are the signs: 2 pluses, 2 minuses or one of each which leaves just two answers.

The second question is how do we get 16x^2: is it (8x)(8x) or (4x)(4x)?