Final answer:
By substituting x = -6 into the quadratic function f(x) = -x^2 - 13, we found that f(-6) = -49.
Step-by-step explanation:
To find the value of the function f(x) = -x^2 - 13 at x = -6, we simply substitute -6 into the equation in place of x:
f(-6) = -(-6)^2 - 13
f(-6) = -36 - 13
f(-6) = -49
So, the value of the function f(x) at x = -6 is -49.