find the primitive 8th root of unity
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Note that 24≡−1 (mod 17), hence 28≡1 (mod 17). So 2 is a primitive 8th root of unity. The other primitive 8th roots of unity mod 17 are 23=8, 25≡15, and 27≡9.
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1
Answer:
Note that 24≡−1 (mod 17), hence 28≡1 (mod 17). So 2 is a primitive 8th root of unity. The other primitive 8th roots of unity mod 17 are 23=8, 25≡15, and 27≡9.
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