Learn Algebra 2
Functions, quadratics, complex numbers, polynomials, radicals and logs. You solve every problem yourself, and the board checks each line as you write it.
5,540,471+ learners enrolled
255 lessons239 challenges1,040 quiz questions
- Beginner friendly
Hands-on interactive lessons
Audio narration on every lesson
Quizzes to test your knowledge
Free certificate of completion
Syllabus
Section 1
Functions & Transformations
Start sectionStartExpandCollapseFunctions as the language of Algebra 2: evaluating with numbers and expressions, domain and range, adding and composing functions, inverses, shifting, stretching and flipping graphs, average rate of change, and functions built from real situations.Functions, Revisited
5 lessons415Expressions as Inputs
5 lessons520Domain and Range
5 lessons320Combining Functions
5 lessons520Composition
6 lessons525Inverse Functions
6 lessons525Shifting Graphs
6 lessons625Stretching and Flipping
5 lessons520Rate of Change
5 lessons520Functions in Stories
5 lessons520Final Challenges
5 lessons525Section 2
Quadratics & Complex Numbers
Start sectionStartExpandCollapseQuadratics in depth: the vertex and axis of symmetry, completing the square, vertex form, then the imaginary unit i, arithmetic with complex numbers, complex solutions of quadratics, the discriminant, systems of a line and a parabola, and quadratic models.The Vertex
5 lessons420Completing the Square
6 lessons525Vertex Form by Algebra
5 lessons520Imaginary Numbers
5 lessons420Complex Arithmetic
6 lessons625Complex Solutions
5 lessons520The Discriminant
4 lessons315Lines Meet Parabolas
5 lessons520Quadratic Models
5 lessons520Final Challenges
5 lessons525Section 3
Polynomials & Rational Expressions
Start sectionStartExpandCollapsePolynomials and rational expressions cover factoring (grouping, cubes), long division, and Remainder & Factor Theorems. Key skills: solving equations, sign charts, operations, simplifying, handling extraneous solutions, and direct/inverse variation.Polynomial Long Division
6 lessons525Remainders and Factors
5 lessons420Factoring Higher Degree
6 lessons625Polynomial Equations
4 lessons415Sign Charts
5 lessons420Rational Expressions
5 lessons420Adding and Subtracting
5 lessons520Rational Equations
6 lessons625Rational Inequalities
3 lessons310Variation
4 lessons415Final Challenges
5 lessons525Section 4
Radicals & Rational Exponents
Start sectionStartExpandCollapseRoots in simplest form: simplifying square and cube roots, adding, subtracting and multiplying radicals, rationalizing denominators, rational exponents, radical equations and their false answers, equations with powers and fractional powers, and radical functions.Simplifying Radicals
6 lessons525Adding & Subtracting Radicals
4 lessons415Multiplying Radicals
5 lessons520Rationalizing
4 lessons415Rational Exponents
5 lessons520Radical Equations
5 lessons520Powers and Roots Equations
5 lessons520Radical Functions
4 lessons415Final Challenges
5 lessons525Section 5
Exponentials, Logs & Sequences
Start sectionStartExpandCollapseExponential functions and their graphs, growth and decay, equations with the same base, logarithms and their rules, solving exponential and log equations (with e and ln), then arithmetic and geometric sequences and their sums.Exponential Functions
5 lessons420Growth and Decay
5 lessons520Same-Base Equations
5 lessons520Meet the Logarithm
5 lessons420Log Rules
5 lessons520Solving with Logs
5 lessons520Log Equations
5 lessons520Arithmetic Sequences
4 lessons415Geometric Sequences
5 lessons520Final Challenges
5 lessons525
Learn by Solving
Work every problem yourself on an interactive board. Each step is a move you choose, every line is checked, and graphs are drawn by hand.
Solving is a game of legal moves. You pick the move; every line follows from the one before it.
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January 2026
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Double or Nothing
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Promotion zoneEvery way to learn
Read, listen, test yourself, ask the AI about your own steps, or look up anything you've already covered. Every lesson meets you where you are.
An equation is a claim: the two sides name the same number. The equals sign asserts sameness, it gives no orders.
A solution is a value of the unknown that makes the claim true. Substitute it and both sides agree.
Solving means changing the form without changing the claim: the same move applied to both sides keeps the balance.
Earn a Certificate
Earn a certificate when you complete a section. Add it to your LinkedIn profile to show how far your math has come.
Certificate of Completion
Math Fundamentals
Add to LinkedInWhy learn Algebra 2 with Coddy
- You do the algebra. Complete the square, divide polynomials, rationalize a denominator: the board accepts only a line that follows from the one above.
- False answers are caught. Radical, rational and log equations can give answers that do not work, and the board checks each one.
- Graphs drawn by hand. Shift, stretch and flip a parabola on the grid, and the check reads exactly what you drew.
- Free certificate of completion you can share on LinkedIn or your resume - proof you finished an interactive Algebra 2 course, not just watched videos.
Frequently asked questions about Algebra 2
What do you learn in Algebra 2?
Is Algebra 2 harder than Algebra 1?
What should I know before starting Algebra 2?
Do I need Geometry before Algebra 2?
Is the Algebra 2 course free?
Do I get a Algebra 2 certificate when I finish?
