3 years ago

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

1 answer:

4 0

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.

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3 years ago

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3 years ago