APFIVE Identifying Even Polynomial Functions
Which of the following polynomial functions is an even function?
A
f(x) = 5x^2 - 7x + 4
B
f(x) = 2x^3 - 4x
C
f(x) = 3x^4 - 2x^2 + 5
D
f(x) = x^4 + 3x^3 - 2x^2 + 1
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