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)

Answer 1

(4) x2+(a-b)..........