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Prove the following: Let a and b be any integers. If n is an odd integer the n2 is an odd integer.
Solution
The general from of an odd nuber is 2n+1
Where n is an integer.
Let 2a+1 and 2b+1 are two odd integers
Where a and b belongs to z
TTheir product =(2a+1)(2b+1)
=2a (2b+1)+2b+1
=4ab+2a+2b+1
=2(2ab+a+b)+1
n2=2×integer+1
n2 =an odd integer

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