Sal gives an overview of Khan Academy’s minicourse, “Algebra Foundations.” In this course, you’ll learn:
 The origins of algebra.

You’ll also learn how to evaluate algebraic expressions with variables.

And finally, you’ll learn how to write, simplify, and interpret algebraic expressions.
To explore our full course on Algebra 1, visit Khan Academy: https://www.khanacademy.org/math/algebra