It isn't; the algebra 1 and 2 that you get taught in middle or high school is elementary algebra. When (if you want to) you get into more advanced algebra, you can learn linear algebra (matrix algebra) and abstract algebra (which involves sets, operations on sets, groups, and many more concepts), and probably several more types of algebra I've never heard of.
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Algebra 2 is harder and more complicated than Algebra 1. It also introduces more variables and harder equations.
I think you mean Algebra 1 & 2 If you did, Algebra 1 is the basic stuff. Algebra 2, you get more complex, but it's still a basic idea.
algebra 2 is more advanced
Geometry is like a block from Algebra 1 to Algebra 2 and it contributes by teaching you the basics of the things you will learn in Algebra 2.
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