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ganeshie8 (ganeshie8):
show that \(2\mid x^2-1 \implies 8\mid x^2-1\)
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OpenStudy (baru):
x has to be odd... so x^2-1 = (x+1)(x-1) (product of two even numbers) so it has to be divisible by 4. thats all i got :/
OpenStudy (baru):
perhaps there is some interesting property of two successive even number?
OpenStudy (dan815):
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