Use the graph of y = ƒ(x) to find each function value: (a) ƒ(-2) (b) ƒ(0) (c) ƒ(1) and (d) ƒ(4). See Example 7(d).

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Identify the function ƒ(x) from the given graph. This means understanding how the graph represents the relationship between x and y, where y = ƒ(x).

For each value of x given (i.e., -2, 0, 1, and 4), locate the corresponding point on the x-axis of the graph.

From each x-value, move vertically to the point on the graph that corresponds to that x. The y-coordinate of this point is the value of ƒ(x) at that x.

Write down the y-coordinate for each x-value: ƒ(-2), ƒ(0), ƒ(1), and ƒ(4). These are the function values you are asked to find.

Double-check each point on the graph to ensure accuracy, especially if the graph has curves or sharp turns, to correctly read the y-values.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Understanding Function Notation

Function notation, written as ƒ(x), represents the output value of a function ƒ for a given input x. Evaluating ƒ(a) means finding the y-value on the graph corresponding to the x-value a. This concept is essential for interpreting and extracting values from the graph.

Reading Graphs of Functions

Reading a graph involves locating specific x-values on the horizontal axis and identifying the corresponding y-values on the vertical axis. This skill allows you to determine function values visually without algebraic expressions, which is crucial for answering questions based on graphs.

Domain and Range of a Function

The domain is the set of all possible input values (x-values) for which the function is defined, while the range is the set of all possible output values (y-values). Understanding domain ensures you only evaluate ƒ(x) at valid points on the graph.

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