Photo credit: Khan Academy
Khan Academy offers great courses in Math, Science, Engineering, Arts, Humanities, Computing, Economics, Finance, and test preparation. This link will take you to the lessons for Algebra 2, which includes: functions, complex numbers, arithmetic with polynomials, radical relationships, rational relationships, exponential growth & decay, exponential & logarithms, Trigonometry, advanced equations & functions, series, modeling, conic sections, and more.