We refer to the letter x as a variable. • x + 5 means‘a number with 5 added on’ • x – 7 means‘a number with 7 subtracted from it’ e.g. Note 1: Expressions • A few Rules: • A number should be written before a letter. • yx 2 = 2y e.g. • Terms should be written in alphabetical order. • xyz and 3b x 4a = 12ab e.g. • We don. Basic Math and SimplifyingAlgebraicExpression. Section 1-1. Expressions and Order of Operations. Objectives. ... Write an algebraicExpression for the cost of any number, n, of team hats. 15 n (15 times the number of hats) Evaluate: 7 - m when m = 2. 7 - 2 = 5. Practice. Book Work: Page 7 #'s 1 - 11. Finish for homework. Simplify AlgebraicExpressions. An AlgebraicExpression is in its simplest terms when it has: no like terms. No parenthesis. Simplifying the Expression. Use the Distributive Property. Example: 3x +2x =(3+2) x =5x. Ex: Simplify and Justify Steps 4x+6-3x =4x+6+(-3x) Definition of Subtraction.
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