Function notation is an important topic in Algebra I for 9th graders. Here’s what you need to know:

1. Basic Structure: A function is usually written as ( f(x) ). Here:

   • ( f ) is the name of the function.
   • ( x ) represents the input value.

2. Domain and Range:

   • The domain is the set of all possible input values you can use.
   • The range is the set of possible output values that you can get.

3. Evaluating Functions: To find the value of a function, you plug the input into the equation. For example, if ( f(x) = x^2 ), then ( f(3) = 3^2 = 9 ).

4. Types of Functions: Functions can be different types like linear, quadratic, or exponential. Each type has its own unique features and graphs.

It’s really important to understand these parts. Studies show that students who understand function notation tend to score 20% higher on tests related to this topic.