Final answer:
Without the specific function or equation for f(x), it's not possible to determine what x is when f(x) = -3. To solve for x, one would need to set the provided function equal to -3 and solve for x.
Step-by-step explanation:
To determine when f(x) equals -3, we need to have an equation or function for f(x). However, no function or equation has been provided with the options A, B, C, or D, so it's not possible to answer the question as it stands. To find the value of x for a given value of f(x), you need the specific equation defining the function f(x). Once you have that, you can set f(x) equal to -3 and solve for x accordingly. For example, if the function was f(x) = x + 6, and f(x) is -3, you would solve the equation x + 6 = -3 by subtracting 6 from both sides to find that x = -9.