Question

Which of the following polynomials has factors (xy – 1)(xy + 1)?

Answer 1

Answer:

xy=2 is the correct answer.

Answer 2

Answer:

${(xy)}^{2} - 1$

Step-by-step explanation:

$(xy - 1)(xy + 1) \\ \\ (a - b)(a + b) = {a}^{2} - {b}^{2} \\ \\ {(xy)}^{2} - 1$