Final answer:
The function f(x) = 3x² + 1 is an even function.
Step-by-step explanation:
A function is even if and only if it satisfies the property f(x) = f(-x) for all values of x in the domain. Similarly, a function is odd if and only if it satisfies the property f(x) = -f(-x) for all values of x in the domain. In the given function, f(x) = 3x² + 1. To determine if it is even, odd, or neither, we need to check if it satisfies the even or odd properties. Let's substitute -x for x in the function:
f(-x) = 3(-x)² + 1 = 3x² + 1
Since f(-x) is equal to f(x), the function f(x) = 3x² + 1 is an even function.