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Hey everyone ❤❤❤If n is ab odd integers , then show that n^2-1 is divisible by 8.please send answer fast ita urgent.

Answer»

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Step-by-step explanation:

Any odd integers in the form 4m + 1 or

4m + 3 for some integer m.

When n = 4m+1

=> -1 = (4m+1)²-1

=> -1 = 16m² + 8M +1-1

=> -1 = 8m ( 2m+1).

=> -1 is divisible by 8

When n= 4m+3

=> n²-1 = (4m+3)²-1

=> n²-1 = 16m² + 24m +9-1

=> n²-1 = 8 ( 2m²+3m+1)

=> n²-1 is divisible by 8

Hence, -1 is divisible by 8 if n is odd POSITIVE integer.



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