
#1
Nov2109, 12:17 PM

P: 20

It just how do i prove that
b^3 +b^2 +1 does not divide by 5 Im thinking this way, cause i know that b^3 +b^2 +1 is not congruent to 0(mod5) therefore we use contradition to prove it. im just not sure how to use contradition? or maybe im looking at this in a completely bad light? maybe there is another method? 



#2
Nov2109, 12:31 PM

PF Gold
P: 1,059

This can be worked out by considering all the cases from 0 to 4 mod 5.




#3
Nov2109, 12:54 PM

Mentor
P: 20,980

Double posted.



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