Question

Which of the following is not a factor of
x4 – 4abx2 – (a2 – b2)
2?
(1) x – (a + b)
(2) x + (a + b)
(3) x2 + (a + b)
2
(4) x2 + (a – b)
2

Answer 1

option 3 is correct answer

Answer 2

option 3 is the right