Answer:
k(-4) = 12
Explanation:
What is a function?
The most simple definition of a function is a set of inputs that have a given set of outputs.
Functions are often written as f(x) = "an expression"
Where "x" is the input and "the expression" results in an output. Whatever the input is you plug into "x" and replace all "x"s with the input
Here, we are given the function k(x) = 8 - x and we want to find k(-4)
This can be rewritten as k(-4) = 8 - x
==> replace all x's with -4
k(-4) = 8 - (-4)
==> remove parenthesis
k(-4) = 8 + 4
==> add 8 and 4
k(-4) = 12