Multiple Choice Questions

The HCF of x2 ndash 3x ndash 4 and 9 ndash x2 is ........

Quantitative Aptitude (CGL) LCM, HCF

The HCF of (x2 – 3x – 4) and (9 – x2) is:

(3 – x2) (x + 1)

(3 + x)

(x – 3) (x + 1)

None of these

Ans (d): x 2 – 3x – 4 = (x – 4) (x + 1)
and 9 – x2 = 32 – x2 = (3 – x) (3 + 1)
So, HCF of both = 1.
Hence the correct option is (d).

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