What is an example of a binomial whose leading coefficient is even

By definition, a binomial is a polynomial formed by two terms. It can also be defined as the sum of two monomials.
 The leading coefficient of a binomial is the number of the term with the highest degree.
 An even number is an integer that can be divided by two.
 Keeping the information above on mind, an example of a binomial whose leading coefficient is even is:
 
 Where the highest degree is  and the leading coefficient is .
 The answer is:

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