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Question

What is the HCF of   (x4  - x2  - 6)    and   (x4  - 4x2  + 3) ?

(a)  x2  - 3                          (b)    x + 2

 (c)   x + 3                         (d)   x2  + 3

A (a) Correct Answer Incorrect Answer
B (b) Correct Answer Incorrect Answer
C (c) Correct Answer Incorrect Answer
D (d) Correct Answer Incorrect Answer

Solution

x4  - x2  - 6 = (x2  - 3) (x2 + 2) And x4  - 4x2  +3 = (x2  - 3) (x2  -1)  HCF = (x2 - 3)

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