What is the HCF of  (x4  - x2  - 6)   and  (x4  - 4x2  + 3) ?
(a)Â x2 Â - 3Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (b)Â Â Â x + 2
 (c)  x + 3             (d)  x2  + 3
x4 Â - x2 Â - 6 = (x2 Â - 3) (x2 + 2) And x4 Â - 4x2 Â +3 = (x2 Â - 3) (x2 Â -1) Â HCF = (x2 - 3)
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