The second degree factors of x4 ā 5x2 - 24 are
(x2 – 8) and (x2 + 3)
(x2 + 24) and (x2 - 1)
(x2 + 6) and (x2 - 4)
(x2 – 7) and (x2 + 2)
The factors of x4 + x2 + 25 are (a) (x2 + 3x + 5) (x2 ā 3x + 5) (b) (x2 + 3x + 5) (x2 + 3x ā 5) (c) (x2 + x +5) (x2 ā x + 5) (d) none of these