Question

What is the even function?

Answer 1

Answer: Choice A

Reason:

Every exponent shown for choice A is an even number, which by extension points us to an even polynomial function.

Choice D has all odd exponents (think of
`\text{x}` as
`\text{x}^1`), which means choice D is an odd polynomial function.

Choices B and C have a mix of even and odd exponents for their terms. This means B and C are neither even nor odd.