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Let x be an integer. prove that x is even if and only if x^2 is divisible by 4.
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Let x be an integer. prove that x is even if and only if x^2 is divisible by 4.

User Ross Ridge
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If x^2 is divisible by 4 then it is an even number because anything divisible by 4 is also divisible by 2. And all numbers divisible by 2 are even numbers.
User Danielnelz
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