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(7x + 2)-(x^2 + 5) in Z_10 =

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+1 vote
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in Cryptograph & Network Security by (60.1k points)
(7x + 2)-(x^2 + 5) in Z_10 =

(a) 9x^2 + 7x + 7

(b) 9x^2+ 6x + 10

(c) 8x^2 + 7x + 6

(d) None of the mentioned

The question was asked in a national level competition.

The doubt is from Polynomial and Modular Arithmetic- III in portion Basic Concepts in Number Theory and Finite Fields of Cryptograph & Network Security

1 Answer

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Best answer
Correct answer is (a) 9x^2 + 7x + 7

Easiest explanation: (7x + 2) – (x^2 + 5) in Z_10 = 9x^2 + 7x +7. We can find this via basic polynomial arithmetic in Z_10.

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