Which of the following functions is even?

Select the best answer from the choices provided.
Select one of the options below as your answer: A. f(x) = 5x2 + 2x + 1 B. f(x) = 3x6 + 2x4 C. f(x) = x2 + 5x3 D. f(x) = -|x| + x

Question

Which of the following functions is even? 

 
Select the best answer from the choices provided. 
Select one of the options below as your answer: A. f(x) = 5x2 + 2x + 1 B. f(x) = 3x6 + 2x4 C. f(x) = x2 + 5x3 D. f(x) = -|x| + x

anonymous · Answer

An even function is a function such that f(x) = f(-x).

anonymous · Answer

f(x)=f(-x) is an even function just plug in -x as easyaspi314 suggests.( fast fingers mate )

anonymous · Answer

thank you!!