The equation 6x6 – 25x5 + 31x4 – 31x2 + 25x – 6 = 0 is reciprocal equation of

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class one and x = 1 in a root

class one and x = -1 in a root

class two and x = ± 1 are roots

class two and x = 1 is a root but not x = -1

answer is C.

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Detailed Solution

reciprocal equation of class always having roots -1and +1

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