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(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 mentionedThe 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

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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