LESSON 2.1 ALGEBRAIC EXPRESSIONS
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1 LESSON 2.1 ALGEBRAIC EXPRESSIONS LESSON 2.1 ALGEBRAIC EXPRESSIONS 83
2 OVERVIEW Here s what you ll learn in this lesson: Simplifying Expressions a. Constants and variables b. Terms and coefficients c. Combining like or similar terms If you wanted to know how many olives were in a container, you might begin by letting the unknown number of olives be denoted by a letter, like x. The letter x is called a variable, since you may decide to vary the number of olives in the box. The study of algebra is concerned with variables. In this lesson you will learn about variables, how to use them in mathematical expressions, and how to simplify and evaluate these expressions. d. Parentheses e. Evaluating expressions f. Formulas: Substitution 84 TOPIC 2 SOLVING LINEAR EQUATIONS AND INEQUALITIES
3 EXPLAIN SIMPLIFYING EXPRESSIONS Summary Definitions An algebraic expression is a combination of numbers, letters, parentheses, brackets, and other grouping symbols such as +,,, and. The different elements of an algebraic expression are given special names to make it easier to refer to each part. Look at the algebraic expression: Terms are the individual quantities: Variables are the letters which stand for numbers: Coefficients are the numeric part of the terms: Constants are the terms without variables: Negative signs are included when writing terms, coefficients, and constants. In the expression x 2 7, the constant is 7, not 7. Expressions enclosed in parentheses are considered a single term. The expression (y 3) + (x + 1) has two terms: (y 3) and (x + 1). Simplifying Expressions Simplifying an expression often makes it easier to work with. To simplify an expression: 1. Use the distributive property to remove any parentheses. 2. Use the commutative property to write the like terms next to each other. 3. Combine the like terms. For example, to simplify the expression: 2x(y + 3) 4(1 xy) Distribute to remove the parentheses. = 2xy + 6x 4 + 4xy + 7 Like terms are terms that have the same variables with the same exponent. For example, x, 3x, and 7x are all like terms. 2. Write the like terms next to each other. = 2xy + 4xy + 6x Combine the like terms. = 6xy + 6x + 3 LESSON 2.1 ALGEBRAIC EXPRESSIONS EXPLAIN 85
4 Evaluating Expressions Sometimes the variables in an expression are assigned specific values. When this happens you can replace the variables with the numbers and evaluate the expression. To evaluate an expression: 1. Replace each variable with its assigned value. 2. Calculate the value of the expression. For example, to evaluate the expression 3x 2 y 4y + 5 when x = 1 and y = 2: 1. Replace x with 1. = 3(1) 2 y 4y + 5 Replace y with 2. = 3(1) 2 (2) 4(2) Calculate. = = 3 When x = 1 and y = 2, 3x 2 y 4y + 5 = 3. Answers to Sample Problems Sample Problems 1. Simplify the expression 3(y + 2x) 5(1 y ) + 4. = 3(y + 2x) 5(1 y ) + 4 a. Distribute to remove parentheses. = 3y + 6x 5 + 5y + 4 b. 3y, 5 c. 6x, 8y, (in either order); 1 b. Write like terms next to each other. = 6x + + 5y + 4 c. Combine like terms. = + 2. Evaluate the expression 2xy 4y when x = 3 and y = 2. = 2xy 4y a. Replace x with 3. = 2(3)y 4y b. 2, 2 c. 12, 16, 3 1 b. Replace y with 2. = 2(3)( ) 4( ) c. Calculate. = + = 86 TOPIC 2 SOLVING LINEAR EQUATIONS AND INEQUALITIES
5 HOMEWORK Homework Problems Circle the homework problems assigned to you by the computer, then complete them below. Explain Simplifying Expressions 1. What are the constants in the expression y 6 + 2x 1? 2. Simplify the expression 2x 5 + 4y + 3x 7y Evaluate the expression 4x 7 when x = What are the terms in the expression 3xy 5x + 8 y x 2 y? 5. Simplify the expression 5 + 3(x 1). 6. Evaluate the expression 2x + 3y + 5 when x = 2 and y = Simplify the expression 3(y 4) + 4y (x + 2) Melissa bought 3 gallons of white paint for $11.00 per gallon, 2 quarts of blue paint for $7.00 per quart, and 1 brush for $6.00. How much did she spend all together? Hint: The amount she spent can be expressed as: 3(11) + 2(7) + 1(6) 10. Mr. Burton is in charge of the cookie sale for his daughter s Girl Scout troop. When the girls turned in their money, he collected 6 twenty-dollar bills, 8 ten-dollar bills, 17 fivedollar bills, and 25 one-dollar bills. How much money did he collect all together? Hint: The amount of money he collected can be expressed as: 6(20) + 8(10) + 17(5) + 25(1) 11. Simplify the expression 7(2 x) 8 2(y 3x) + 4y. 12. Evaluate the expression xy 2 4y + 2 3x when x = 3 and y = Evaluate the expression 3xy 2x + 1 y when x = 1 and y = 2. LESSON 2.1 ALGEBRAIC EXPRESSIONS HOMEWORK 87
6 APPLY Practice Problems Here are some additional practice problems for you to try. Simplifying Expressions 1. What are the terms in the expression 6x 3 + 5xy 2 y + 25? 2. What are the terms in the expression 3a 3 2a 2 b + 7b 2 6? 3. Simplify: 2(3y + 7) Simplify: 8 4(a + 3) 5. Simplify: 3 5(x 7) 6. Simplify: 7b b Simplify: 4x x Simplify: 6a 13 5a Simplify: 2(y 3) + 5(y + 4) 10. Simplify: 5a(b 7) 2(3a + 4) 11. Simplify: 4(x + 5) 3x (y + 3) 12. Simplify: 7(b 2 + 2b) 3(b 5) 13. Simplify: 12(x 3) 7(2x 2 + 6x ) 14. Simplify: 11(a + 1) + 8(a 2 3a) 15. Simplify: 10(y + 7) (y 2 + 2y ) 16. Simplify: 15(2 b ) (3b b 2 ) 17. Simplify: 15(x 2) (3x x 2 ) 18. Simplify: 4b(a + 5) 7a 2(3ab b 2 ) 19. Simplify: 7m(n 6) + 10m + 3(n 2 8mn) 20. Simplify: 5x(6 y ) + 5x + 4(y 2 2xy) 21. Evaluate 7a 3b + 9 when a = 3 and b = Evaluate 8m + n 17 when m = 5 and n = Evaluate 3x + 4y 5 when x = 6 and y = Evaluate 3a 2 7a 6b when a = 3 and b = Evaluate 10m + 2n 8n 2 when m = 5 and n = Evaluate 2x 2 x 2y when x = 5 and y = Evaluate 3x 3 6xy 5xz + 4z 1 when x = 2, y = 4, and z = Evaluate 2a 3 7ab + 3ac 10c + 8 when a = 2, b = 3, and c = 5 88 TOPIC 2 SOLVING LINEAR EQUATIONS AND INEQUALITIES
7 Practice Test EVALUATE Take this practice test to be sure that you are prepared for the final quiz in Evaluate. 1. What are the coefficients in the expression 2x 2 y y + 7xy 4y ? 2. Simplify the following expression by using the distributive property and combining like terms: 7(x + 3) + 2(9 x ). 3. Simplify the following expression by using the distributive property and combining like terms: y (3 y ) + 5(x + y 2 ) x(2 7y ). 4. Evaluate the expression 2x 3 4x 2 + 7x 6 when x = Simplify the following expression by using the distributive property and combining like terms: y (6 + y ) 5(y 2 1) Evaluate the expression 4x 2 y + y 5xy 2 15 when x = 5 and y = Simplify the following expression by using the distributive property and combining like terms: x 2 (3 + y ) 2(5x x 2 ) + 6x 2 y. 5. Evaluate the expression 5x + 2xy 5y 2 when x = 3 and y = 2. LESSON 2.1 ALGEBRAIC EXPRESSIONS EVALUATE 89
8 90 TOPIC 2 SOLVING LINEAR EQUATIONS AND INEQUALITIES
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