Prove that if x and y are odd positive integers then x square + y square is even but not divisible by 9.
Anonymous:
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Step-by-step explanation:
3 is odd and so is 9. morever,
3^2 + 9^2 = 9 + 81 = 90 which is DIVI SIBLE by 9!!!!!!!!!
so the second part of the question is not true
Can you please express the terms in form of X and Y and then in numbers!
And I don't think that your answer is correct!
it is correct. the sum of two odd numbers is Always even, but it could divisible by 9 like the exemple i showed you
if x = 2k +1 and y = 2l +1 are two odd numbers then x + y = 2(k + l + 1) which is even. But x^2 + y^2 = 4(k^2 + l^2 + k + l ) + 2 and for k = 1 , l = 4 we would get 90 which is divisible by 9.
Read the question carefully!
It is asked to prove that X square plus y square which is even is NOT divisible by 9
We need to PROVE the same.
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