Given the function, y = f(x), for which f(x) = 3:
The function essentially states, “What is the value of x when y = 3?” The x inside the parenthesis is the input.
All you need to do is find y = 3, then determine what is its corresponding x-coordinate.
In reference to the graph, the corresponding x-coordinate of y = 3 is -3.
Therefore, the input value is -3.
f(-3) = 3
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