Proving with Congruence of intergers

doggie_Walkes

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?

robert Ihnot

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

Mark44

Double posted.

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doggie_Walkes	Proving with Congruence of intergers 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?

robert Ihnot Recognitions: Gold Member	This can be worked out by considering all the cases from 0 to 4 mod 5.

Mark44 Mentor	Double posted.