6. Show that x -1 is a factor of x5 -1 while x5 +1 is not divisible by x -1.
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Answer:
By factor theorem,
(i) f(1) should be = 0 if x - 1 is a factor of f(x). (f(x) = x⁵ - 1)
f(1) = 1⁵ - 1 = 0
(ii) f(1) for x⁵ + 1 = 1⁵ + 1 = 2
Hence x + 1 is not a factor of x⁵ + 1
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