3.6.3 Function Notation and Finding Function Values

Question 1

Function notation

Answer 1

• replaces the “y =” in an equation with “f(x) =” which shows that each y-value depends on the value used for x.

Question 2

f(x)

Answer 2

• shows the y-value for the given x and shows that the y-value can be found when an x-value is known and used in the equation. Other letters are frequently used as well, so that you may find g(x), h(x), and so on.
• f(x) is read “f of x.” The expression f (2) is read as “f of 2”. f (2) indicates the value that y has in this function when x = 2.