Answer:
A) Tamara's work is correct.
Explanation:
To determine whether a function is even, odd, or neither, we need to check whether f(-x) is equal to f(x) or -f(x).
In this case, Tamara correctly found the expression for f(-x) in step 1, and then in step 2, she checked whether f(-x) is equal to f(x) or -f(x).
Since f(-x) is equal to f(x), Tamara correctly concluded that f is an even function.