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If n is an odd positive integer, show that (n^2-1) divisible by 8.

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asked Jan 29, 2018 in Mathematics by sforrest072 (157,439 points) ● 61 ● 410 ● 941

If n is an odd positive integer, show that (n2-1) divisible by 8.

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+1 vote
answered Jan 29, 2018 by mdsamim (213,225 points) ● 5 ● 10 ● 15
selected Jan 29, 2018 by sforrest072
 
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We know that an odd positive integer n is of the form (4q+ 1) or (4q+3) for some integer g.

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