Writing expressions Objective:

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Writing expressions Objective: 1. Write verbal phrases and sentences as simple as algebraic expressions.

4.2 Writing Expressions An algebraic expression is an expression that contains a variable. For example: x – 4 or 5(n+3) When solving a problem you may have to translate words or phrases into algebraic expressions. The following chart shows the operations that may be suggested by words or phrases: Addition Subtraction Multiplication Division plus minus Times Divided by sum difference product quotient More than Less than Double (× 2) Triple (× 3) Half of (÷2) Increased by Decreased by by Separate equally… Gain of Less of Twice (× 2) per

Examples Write an algebraic expression for each phrase. Five less than a number C Four times the sum of a number N and 3. Six more than a number X Write a phrase for each algebraic expression. X + 4 2. 11(5-R) 3. 2K +6

homework Write a phrase for each algebraic expression. 5. 4a + 2b Write an algebraic expression for each phrase. Fifteen increased by T A number M decreased by ten The product of R and eight Five years more than Luis Twice as many oranges.