## Course Overview

In K^{12} High School Algebra I, students develop algebraic fluency by learning the skills needed to solve equations and perform manipulations with numbers, variables, equations, and inequalities. They also learn concepts central to the abstraction and generalization that algebra makes possible. Students learn to use number properties to simplify expressions or justify statements; describe sets with set notation and find the union and intersection of sets; simplify and evaluate expressions involving variables, fractions, exponents, and radicals; work with integers, rational numbers, and irrational numbers; and graph and solve equations, inequalities, and systems of equations. They learn to determine whether a relation is a function and how to describe its domain and range; use factoring, formulas, and other techniques to solve quadratic and other polynomial equations; formulate and evaluate valid mathematical arguments using various types of reasoning; and translate word problems into mathematical equations and then use the equations to solve the original problems.

## Course Outline

### SEMESTER 1

### Unit 1: Algebra Basics

The English word algebra and the Spanish word *algebrista* both come from the Arabic word *al-jabr*, which means "restoration." A barber in medieval times often called himself an *algebrista*. The algebrista also was a bonesetter who restored or fixed bones. Mathematicians today use algebra to solve problems.

- Semester Introduction
- Expressions
- Variables
- Translating Words into Variable Expressions
- Equations
- Translating Words into Equations
- Replacement Sets
- Problem Solving
- Unit Review
- Unit Test

### Unit 2: Properties of Real Numbers

Every rainbow contains the colors red, orange, yellow, green, blue, indigo, and violet. These seven colors form a set with properties that scientists, engineers, and artists use every day. Numbers can also be grouped into sets, and these number sets have properties that can help solve problems.

- Number Lines
- Sets
- Comparing Expressions
- Number Properties
- Distributive Property
- Algebraic Proof
- Opposites and Absolute Value
- Unit Review
- Unit Test

### Unit 3: Operations with Real Numbers

There are many different kinds of numbers. Negative numbers, positive numbers, integers, fractions, and decimals are just a few of the many groups of numbers. What do these varieties of numbers have in common? They all obey the rules of arithmetic. They can be added, subtracted, multiplied, and divided.

- Addition
- Subtraction
- Multiplication
- Reciprocals and Division
- Applications: Number Problems

### Unit 4: Solving Equations

The Greek mathematician Diophantus is often called "the father of algebra." His book *Arithmetica* described the solutions to 130 problems. He did not discover all of these solutions himself, but he did collect many solutions that had been found by Greeks, Egyptians, and Babylonians before him. Some people of long ago obviously enjoyed doing algebra. It also helped them, and can help you, solve many real-world problems.

- Addition and Subtraction Equations
- Multiplication and Division Equations 1
- Multiplication and Division Equations 2
- Multiple Transformations
- Variables on Both Sides of an Equation
- Transforming Formulas
- Estimating Solutions
- Cost Problems
- Unit Review
- Unit Test

### Unit 5: Solving Inequalities

Every mathematician knows that 5 is less than 7, but when is *y < x?* An inequality symbol can be used to describe how one number compares to another. It can also indicate a relationship between values.

Inequalities

- Solving Inequalities
- Combined Inequalities
- Absolute Value Equations and Inequalities
- Applications: Inequalities
- Unit Review
- Unit Test

### Unit 6: Applying Fractions

What do a scale drawing, a bicycle's gears, and a sale at the local store all have in common? They all present problems that can be solved using equations with fractions.

- Ratios
- Proportions
- Percents
- Applications: Percents
- Applications: Mixture Problems
- Unit Review
- Unit Test

### Unit 7: Linear Equations and Inequalities

You've probably heard the phrase, "That's where I draw the line!" In algebra, this expression can be taken literally. Linear functions and their graphs play an important role in the never-ending quest to model the real world.

- Equations in Two Variables
- Graphs
- Lines and Intercepts
- Slope
- Slope-Intercept Form
- Point-Slope Form
- Parallel and Perpendicular Lines
- Equations from Graphs
- Applications: Linear Models
- Graphing Linear Inequalities
- Inequalities from Graphs
- Unit Review
- Unit Test

### Unit 8: Systems of Equations

When two people meet, they often shake hands or say "hello" to each other. Once they start talking to each other, they can find out what they have in common. What happens when two lines meet? Do they say anything? Probably not, but whenever two lines meet, they have at least one point in common. Finding the point at which they meet can help solve problems in the real world.

- Systems of Equations
- Substitution Method
- Linear Combination
- Linear Combination with Multiplication
- Applications: Systems of Linear Equations
- Systems of Linear Inequalities
- Unit Review
- Unit Test

### Unit 9: Semester Review and Test

- Semester Review
- Semester Test

### SEMESTER 2

### Unit 1: Relations and Functions

A solar cell is a little machine that takes in solar energy and puts out electricity. A mathematical function is a machine that takes in a number as an input and produces another number as an output. There are many kinds of functions. Some have graphs that look like lines, while others have graphs that curve like a parabola. Functions can take other forms as well. Not every function has a graph that looks like a line or a parabola. Not every function has an equation. The important thing to remember is that any valid input into a function results in a single result out of it.

- Semester Introduction
- Relations
- Functions
- Function Equations 1
- Function Equations 2
- Absolute Value Functions
- Direct Linear Variation 1
- Direct Linear Variation 2
- Quadratic Variation
- Inverse Variation
- Translating Functions
- Unit Review
- Unit Test

### Unit 2: Rationals, Irrationals, and Radicals

Are rational numbers very levelheaded? Are irrational numbers hard to reason with? Not really, but rational and irrational numbers have things in common and things that make them different.

- Rational Numbers
- Terminating and Repeating Numbers
- Square Roots
- Irrational Numbers
- Evaluating and Estimating Square Roots 1
- Evaluating and Estimating Square Roots 2
- Radicals with Variables 1
- Radicals with Variables 2
- Roots of Equations
- The Pythagorean Theorem
- Higher Roots
- Unit Review
- Unit Test

### Unit 3: Working with Polynomials

Just as a train is built from linking railcars together, a polynomial is built by bringing terms together and linking them with plus or minus signs. Basic operations on polynomials work the same way as adding, subtracting, multiplying, and dividing numbers.

- Overview of Polynomials
- Adding and Subtracting Polynomials
- Multiplying Monomials
- Multiplying Polynomials by Monomials
- Multiplying Polynomials
- The FOIL Method
- Unit Review
- Unit Test

### Unit 4: Factoring Polynomials

A polynomial is an expression that has variables that represent numbers. A number can be factored, but what about a polynomial? Sometimes yes and sometimes no. Finding ways to write a polynomial as a product of factors can be quite useful.

- Factoring Integers
- Properties of Exponents
- Dividing Monomials
- Dividing Polynomials by Monomials
- Common Factors of Polynomials
- Factoring Perfect Squares
- Factoring Differences of Squares
- Factoring Quadratic Trinomials 1
- Factoring Quadratic Trinomials 2
- Factoring Completely
- Finding Roots of a Polynominal
- Unit Review
- Unit Test

### Unit 5: Quadratic Equations

Solving equations can help answer many kinds of problems. Linear equations usually have one solution, but what about quadratic equations? How many solutions can a quadratic equation have and what do the solutions look like?

- Solving Perfect Square Equations
- Completing the Square
- The Quadratic Formula
- The Discriminant
- Solving Quadratic Equations
- Equations and Graphs: Roots and Intercepts
- Applications: Area Problems
- Applications: Projectile Motion
- Unit Review
- Unit Test

### Unit 6: Rational Expressions

A fraction always has a number in the numerator and in the denominator. However, those numbers can actually be expressions that represent numbers, which means that all sorts of interesting things can happen with fractions. Fractions with variable expressions in the numerator and denominator can help solve many kinds of problems.

- Simplifying Rational Expressions
- Multiplying Rational Expressions
- Dividing Rational Expressions
- Adding and Subtracting Rational Expressions 1
- Adding and Subtracting Rational Expressions 2
- Unit Review
- Unit Test

### Unit 7: Logic and Reasoning

Professionals use logical reasoning in a variety of ways. Just as lawyers use logical reasoning to formulate convincing arguments, mathematicians use logical reasoning to formulate and prove theorems.

- Hypothesis and Conclusion
- Reasoning and Arguments
- Forms of Conditional Statements
- Inductive and Deductive Reasoning
- Analyzing and Writing Proofs
- Counterexample
- Unit Review
- Unit Test

### Unit 8: Semester Review and Test

- Semester Review
- Semester Test