Question

Explain how to use a graph of the function f(x) to find f(3).

Answer 1

Usually there will be a line through the graph, labeling f(x) = ..... so plug in f(3) and follow the line on the x-axis to look for 3 then find y

Answer 2

A function shows the relationship between the input and output variables.

The value of f(3) is the value of the function, when x = 3

The following steps can be used to determine the value of f(3)

• Locate point 3 on the x-axis.
• Trace that point to the line or curve of the function.
• The point on x =3, when this trace meets the line or curve of f(3), is the value of the function.

For instance, the value of f(3) in the attached graph of f(x) is 4

See attachment for further explanation.

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