Definition and examples of algebraic expressions versus general expressions.
Slide titled "Algebraic Expressions" explaining that an expression consists of numbers, operation symbols, and grouping symbols, with algebraic expressions containing variables. Examples include 3 + 4, 6 - 2, (6 + 3) - 1 for expressions, and 3(c + 8), 2a, 9 - x for algebraic expressions. A note highlights that equal signs are not present in expressions.