Just get a PreCalculus textbook, such as the new one by Axler. These titles seem to usually contain most of the algebra and trigonometry covered in Algebra 2 courses, with or without trigonometry, and often also have a bit more.
I used Gelfand and like it very much, it introduces problem solving, patterns, and some more interesting algebra than is typical, but it is small. So, if you want to get the equivalent to a full sized precalculus textbook, around the same price, though more fun, you'd need to go for the most of the whole set of Gelfand correspondence books:
You likely wouldn't need Part 1 or 5, because 1 you probably already know and 5 is extra.
The Method of Coordinates Part 1
Functions and Graphs (Dover Books on Mathematics) Part 2
Sequences, Combinations, Limits (Library of School Mathematics, V. 3) (Part 3 of the original series, Library School of Mathematics)
Algebra Part 3
Trigonometry Part 4
Lines and Curves: A Practical Geometry Handbook Part 5