Mathematics, 04.02.2020 23:54, silveryflight

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

a. determine whether –(x3 + 5x + 1) is equivalent to x3 + 5x + 1.
b. determine whether (–x)3 + 5(–x) + 1 is equivalent to x3 + 5x + 1.
c. determine whether –x3 + 5x + 1 is equivalent to –(x3 + 5x + 1).
d. 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?