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Ch 22: PSAT Math: Functions

About This Chapter

Review the elements of math functions to prepare for the PSAT. Video lessons and quizzes incorporate all of the elements of the math functions section in a simple and clear manner.

PSAT Math: Functions - Chapter Summary

Our video lessons can help you learn the math function concepts that are needed to score high when taking the math section of the PSAT. These math function video lessons provide insight regarding the topics below:

  • Defining function domain and range, exponential functions and basic functions
  • Composing functions
  • Adding, subtracting, multiplying and dividing functions
  • Graphing basic functions
  • Understanding inverse functions
  • Simplifying and factoring polynomial functions

Video lessons present the concepts above in short, simple-to-understand chunks that work in tandem with quizzes that provide immediate feedback. Use quiz results to determine if you're ready to take PSAT math test.

PSAT Math Objectives

The PSAT math test has 48 questions that must be completed within 70 minutes. The following three areas are emphasized on the updated PSAT math test:

  • Heart of Algebra
  • Problem solving and data analysis
  • Passport to Advanced Math

The main goal of the PSAT is to help you figure out if you're prepared to sit for the SAT. When you receive your PSAT scores, you will be able to identify the areas where you have a strong understanding and the areas where you need to spend more time training. Since the National Merit Scholarship Corporation (NMSC) is a co-sponsor of the PSAT, there is a chance that you may be selected to participate in an NMSC scholarship program. By taking the PSAT, the NMSC also provides you with tools for college and career planning.

13 Lessons in Chapter 22: PSAT Math: Functions
What is a Function: Basics and Key Terms

1. What is a Function: Basics and Key Terms

Mapping numbers sounds complex, but we do it when we buy gasoline. We pump gasoline, and the gas station charges us based on the amount of gas that we pump. Learn how this relates to functions while reviewing the basics and notations in this lesson.

Functions: Identification, Notation & Practice Problems

2. Functions: Identification, Notation & Practice Problems

A function is simply a rule that takes one number and turns it into another. But some special conditions must apply for it to be a true mathematical function. Learn about those conditions and how we write functions here!

What Is Domain and Range in a Function?

3. What Is Domain and Range in a Function?

The domain and range are the possible outputs and inputs of a function. In this lesson, learn about what might restrict the domain and how to figure out the domain and range from a graph.

How to Compose Functions

4. How to Compose Functions

Function composition is the process of putting two or more functions together. This video lesson will explain how this process works and also show you how to evaluate functions that have been composed.

How to Add, Subtract, Multiply and Divide Functions

5. How to Add, Subtract, Multiply and Divide Functions

Adding, subtracting, multiplying and dividing functions is about as simple as substituting in expressions and then just doing whichever operation it asks you to do. Check out this video lesson to see some examples of this and learn just how easy it is!

Applying Function Operations Practice Problems

6. Applying Function Operations Practice Problems

In this lesson, learn how to apply all the different properties of functions to solve complex problems. From function operations and composition to domain and range, get your practice here!

Graphing Basic Functions

7. Graphing Basic Functions

Graphs are just like maps - when you know the language! Review how locations have x and y coordinates similar to latitude and longitude, and how to plot points in the Cartesian plane.

Compounding Functions and Graphing Functions of Functions

8. Compounding Functions and Graphing Functions of Functions

We know that functions map numbers to other numbers, so what happens when you have a function of a function? Welcome to functions within functions, the realm of composite functions!

Understanding and Graphing the Inverse Function

9. Understanding and Graphing the Inverse Function

If you use a function to map a to b, is there a way to go back from b to a again? Learn how to find and graph inverse functions so that you can turn a into b and back into a.

Inverse Functions

10. Inverse Functions

Inverse functions are two functions that do exactly opposite things. Check out this lesson to learn about how to write inverse functions, find inverse functions, and predict whether or not they exist.

What Is an Exponential Function?

11. What Is an Exponential Function?

Brand new technologies don't always catch on right away because they can be expensive and don't always work as well as they should. But once the price comes down, and they start to work better, it doesn't take very long before it seems like everyone has one. Learn about the numbers behind this, exponential functions!

Polynomials Functions: Properties and Factoring

12. Polynomials Functions: Properties and Factoring

Everything from projectile motion to trigonometric functions can be described by polynomials. Review factoring, polynomials and quadratic functions in this lesson.

Polynomials Functions: Exponentials and Simplifying

13. Polynomials Functions: Exponentials and Simplifying

How do we keep track of a rapidly multiplying population of bunnies? Well, those are simply powers of 2. Review powers and simplify problems with exponents in this lesson.

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