For which of the following functions is f(e) = f(−e) for all values of e ? Choose the correct option
A) f(x) = x^3 + 3 B) f(x) = −x C) f(x) = 2x + 3 D) f(e) = −e^2 + 2 E) f(x) = 5x − 4
f(e) = f(−e)   The above is a property of an even function .   f(e) = f^(n)   f(e) = f(−e) will hold when n is an even integer .   The only case when e is even is option f(e) = −e^2 + 2   Answer f(e) = −e^2 + 2
<result>D</result>
For which of the following functions is f(e) = f(−e) for all values of e ?