but to prove that it is true all the time we can use algebra. Write the first of the two even numbers as \(2n\), where \(n\) is an integer. The second even number can be written as \(2m\), where ...

but to prove that it is true all the time we must use algebra. Write the first of the two even numbers as \(2n\), where \(n\) is an integer. The second even number can be written as \(2m\), where ...