Which if any of the following functions are even A fx 3x3 2

Which, if any, of the following functions are even? A. f(x) = 3x3 +21 B. f(x)=/x2+1 C. f(x)= 1. A and B only 2. B only 3. B and C only 4 4. none of them 5. A and C only 6. A only

Solution

Answer is b and c only

because f(x) = f(-x) for f(x) = x²

but in part a f(x) = 3x³ + 2|x| and f(-x) = -3x³ + 2|x| , imples not even function