Mathematics, 07.01.2020 07:31, ava5015

Which statement best describes how to determine whether f(x) = x3 + 5x + 1 is an even function?
determine whether –(x3 + 5x + 1) is equivalent to x3 + 5x + 1.
determine whether (–x)3 + 5(–x) + 1 is equivalent to x3 + 5x + 1.
determine whether –x3 + 5x + 1 is equivalent to –(x3 + 5x + 1).
determine whether (–x)3 + 5(–x) + 1 is equivalent to –(x3 + 5x + 1).

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Which statement best describes how to determine whether f(x) = x3 + 5x + 1 is an even function?