Final answer:
The value of f(x) = 9² when x = -2 is 81.
Step-by-step explanation:
The value of f(x) = 9² when x = -2 can be found by substituting the value of x into the function:
f(-2) = 9² = 9 * 9 = 81
Therefore, the value of f(x) when x = -2 is 81.