KhanAcademy.com features instructional videos, practice problems and community forums for algebra 2. IXL.com features only practice problems, but covers a greater variety of concepts than Khan Academy covers.
Khan Academy provides two- to three-minute instructional videos and sets of practice problems on algebra 2 concepts. From KhanAcademy.com, select Subjects, hover over Math, and select Algebra II to see a list of concepts including systems of equations, rational functions, logarithmic functions, conic sections and matrices. Selecting a topic displays a list of available videos and sets of quiz-style practice problems. The practice problems feature hints and video examples of related problems. Khan Academy also features community forums in which users can discuss or ask questions about the instructional videos.
IXL provides practice problems as supplemental resources but does not provide instructional materials. From IXL.com, select Math and then Algebra 2 Skills to view a list of algebra 2 concepts including inequalities, conic sections, polynomials, and sequences and series. Selecting a topic displays a set of quiz-style problems. The application tracks time elapsed and questions attempted, and it calculates a grade for the user based on accuracy and speed of completed questions. IXL also provides lists of Common Core and state-specific standards, so users can ensure they are keeping up with the course.