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Question -

The product (x2 – 1) (x4 +x2 + 1) is equal to
(a) x8 –   1
(b) x8 + 1
(c) x6 –   1
(d) x6 + 1



Answer -

(x2 – 1) (x4 + x2 +1)
= (x2)3 – (1)3 = x6 –1                           (c)

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