Answer:
When f(x)=4, x = -4 and the value of f(4) is -2.
When finding the value of f(4), f(x) = y, then f(4) means finding the value of y when x = 4.
- looking at the graph, when x = 4, the corresponding y value is -2.
When finding the when f(x) = 4, we have to find what x values occurs when y = 4.
- looking at the graph, when y = 4, x = -4