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Proving with Congruence of intergers

by doggie_Walkes
Tags: congruence, intergers, proving
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Nov21-09, 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?
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robert Ihnot
Nov21-09, 12:31 PM
PF Gold
P: 1,059
This can be worked out by considering all the cases from 0 to 4 mod 5.
Nov21-09, 12:54 PM
P: 21,215
Double posted.

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