Algebra 2: Free Course

About this course

Build a broad Algebra 2 foundation through this free Khan Academy course. All two hundred source videos are preserved across the twelve published topic groups, from polynomial arithmetic and complex numbers to logarithms, function transformations, equations, trigonometry and modeling. Repeated explanations and worked examples remain available for revision.

Course at a glance

What you’ll learn

• Work with polynomial arithmetic, factorization, division and graphs.
• Explore complex numbers, rational exponents and exponential models.
• Connect logarithms, function transformations and equation-solving methods.
• Use trigonometric and algebraic models to interpret mathematical situations.

Skills you’ll gain

• Algebra 2
• Polynomials
• Complex numbers
• Logarithms
• Function analysis
• Mathematical modeling

Course Overview

The playlist follows the same twelve main topic areas listed in Khan Academy’s Algebra 2 curriculum: polynomial arithmetic, complex numbers, factorization, polynomial division, polynomial graphs, rational exponents, exponential models, logarithms, function transformations, equations, trigonometry and modeling. Multiple worked examples develop the ideas rather than providing only a short overview. All two hundred source occurrences remain in order, including repeated recordings where the publisher includes them. The classroom provides the complete recorded playlist edition; platform quizzes, unit tests, mastery tracking and the course challenge are separate learning formats. Its practical value comes from solving small examples yourself, checking the reasoning and connecting algebraic expressions with their graphical or contextual meaning.

How to study the course

• Begin with polynomial arithmetic and complex numbers, then work through factorization, division and graphs. Keep an error log so later examples address a specific difficulty.
• Study exponents, exponential models, logarithms, transformations and equations as connected topics. Check a result by substitution or a simple graph where appropriate.
• Complete trigonometry and modeling, then revisit worked examples from earlier sections. Explain the assumptions and meaning of a model before relying on its calculation.

Use the searchable classroom lesson list to revisit a specific explanation. Pause after a useful demonstration, reproduce a small example and explain the result in your own words. Keep a short note of what worked, what changed and what you still need to understand before moving on.

Who is this for?

This course suits learners with an Algebra 1 foundation, students revising Algebra 2 and adults rebuilding mathematical skills for later study. The large lesson set also serves as a searchable reference for a particular technique or worked example.

Before you start

Comfort with basic algebra, fractions, equations and graph reading is recommended. A notebook and suitable calculator can help with practice. The videos do not include the platform’s full interactive assessments, teacher marking, school credit or an academic qualification.

Put the lessons into practice

Choose one example from a polynomial section, one from logarithms or equations and one from modeling. Solve each on paper before viewing the full explanation, then compare the methods rather than just the final answer. Record a mistake or assumption you needed to correct. For the modeling example, state what the variables represent and what the result means in context. Make a second small example with changed values to test whether you understand the method. Keep references to the relevant source lessons for later revision.

This optional activity is provided by WikiFree for independent practice. It is not a graded assignment from the instructor. Keep your working notes, check the result against the task you defined and return to the relevant lesson when an assumption or technique is unclear.

Certificate / Assessment

Watching the public videos and using WikiFree progress tracking does not award a certificate, exam voucher, academic credit or instructor assessment.

Use your practice output to review what you can now explain and repeat independently. Completion tracking records your study progress; it does not replace an assessed qualification or professional experience.

Frequently asked questions

Provider: Khan Academy. Videos play from the Khan Academy channel on YouTube.