2 9 Combining Like Terms Bell Work Evaluate

2 -9 Combining Like Terms Bell Work Evaluate each expression for y = 3. 1. 3 y + y 2. 7 y 12 21 3. 10 y – 4 y 18 4. 9 y 27 5. y + 5 y + 6 y 36 30 6. 10 y Course 2

2 -9 Combining Like Terms Learn to combine like terms. Course 2

2 -9 Combining Like Terms In the expression 7 x + 5, 7 x and 5 are called terms. A term can be a number, a variable, or a product of numbers and variables. Terms in an expression are separated by + and –. 7 x term + 5 term – 3 y 2 + term y+ x 3 term In the term 7 x, 7 is called Coefficient the coefficient. A coefficient is a number that is multiplied by a variable in an algebraic expression. A variable by itself, like y, has a coefficient of 1. So y = 1 y. Course 2 Variable

2 -9 Combining Like Terms Term Coefficient Course 2 4 a 2 3 3 k 2 x 4. 7 t 9 4 2 3 3 1 1 4. 7 9

2 -9 Combining Like Terms Like terms are terms with the same variable raised to the same power. The coefficients do not have to be the same. Constants, like 5, 1, 2 and 3. 2, are also like terms. Like Terms Unlike Terms Course 2 w and w 5 and 1. 8 7 5 x 2 and 2 x 6 a and 6 b 3. 2 and n The exponents The variables Only one term contains a are different variable 3 x and 2 x

2 -9 Combining Like Terms Additional Example 1: Identifying Like Terms Identify like terms in the list. 3 t 5 w 2 7 t 9 v 4 w 2 8 v Look for like variables with like powers. 3 t 5 w 2 7 t 9 v Like terms: 3 t and 7 t 4 w 2 8 v 5 w 2 and 4 w 2 9 v and 8 v Helpful Hint Use different shapes or colors to indicate sets of like terms. Course 2

2 -9 Combining Insert Lesson Title Here Like Terms Try This: Example 1 Identify like terms in the list. 2 x 4 y 3 8 x 5 z 5 y 3 8 z Look for like variables with like powers. 2 x 4 y 3 8 x 5 z Like terms: 2 x and 8 x Course 2 5 y 3 8 z 4 y 3 and 5 y 3 5 z and 8 z

2 -9 Combining Like Terms Additional Example 2 A & 2 B: Combining Like Terms Combine like terms. A. 6 t – 4 t 6 t and 4 t are like terms. 2 t Subtract the coefficients. B. 45 x – 37 y + 87 In this expression, there are no like terms to combine. Course 2

2 -9 Combining Like Terms Additional Example 2 C: Combining Like Terms Combine like terms. C. 3 a 2 + 5 b + 11 b 2 – 4 b + 2 a 2 – 6 (3 a 2 + 2 a 2) + (5 b – 4 b) + 11 b 2 – 6 5 a 2 + b + 11 b 2 – 6 Course 2 Identify like terms. Group like terms. Add or subtract the coefficients.

2 -9 Combining Insert Lesson Title Here Like Terms Try This: Example 2 A &2 B Combine like terms. A. 5 y + 3 y 8 y 5 y and 3 y are like terms. Add the coefficients. B. 23 x 2 – 13 x + 6 In this expression, there are no like terms to combine. Course 2

2 -9 Combining Insert Lesson Title Here Like Terms Try This: Example 2 C Combine like terms. C. 4 x 2 + 4 y + 3 x 2 – 4 y + 2 x 2 + 5 Identify like terms. (4 x 2 + 3 x 2 + 2 x 2)+ (4 y – 4 y) + 5 Group like terms. 9 x 2 + 5 Course 2 Add or subtract the coefficients.

2 -9 Combining Insert Lesson Title Here Like Terms Try This: Example 2 D Combine like terms. D. 12 x 2 + y – 3 + x 2 - 2 y + 1 + 4 x 12 x 2 + y - 3 + x 2 - 2 y + 1 + 4 x Identify like terms. (12 x 2 + x 2 ) + (y – 2 y) + (-3 + 1) + 4 x Group like terms. 13 x 2 - y – 2 + 4 x Add or subtract or the coefficients. 2 13 x + (- y) + (– 2) + 4 x Course 2

2 -9 Combining Like Terms Additional Example 3: Geometry Application Write an expression for the perimeter of the triangle shown. Combine like terms in the expression. 2 x + 3 x 3 x + 2 Write an expression using the side lengths. (x + 3 x + 2 x) + (2 + 3) Identify and group like terms. 6 x + 5 Combine like terms. x + 3 x + 2 x + 3 Course 2

2 -9 Combining Insert Lesson Title Here Like Terms Try This: Example 3 Write an expression for the perimeter of the triangle shown. Combine like terms in the expression. 2 x + 1 x Write an expression using the side lengths. (x + 2 x) + (1 + 1) Identify and group like terms. 5 x + 2 Combine like terms. x + 2 x + 1 Course 2

2 -9 Combining Insert Lesson Like. Title Terms Here Lesson Quiz: Part 1 Identify like terms. 1. 3 n 2 5 n 2 n 3 8 n 2. a 5 2 a 2 a 3 3 a 5 n, 8 n 4 a 2 2 a 2, 4 a 2 Combine like terms. 3. 4 a + 3 b + 2 a 6 a + 3 b 4. x 2 + 2 y + 8 x 2 9 x 2 + 2 y Course 2

2 -9 Combining Insert Lesson Like. Title Terms Here Lesson Quiz: Part 2 5. Write an expression for the perimeter of the given figure. 2 x + 3 y x+y 2 x + 3 y 6 x + 8 y Course 2

2 -9 Combining Insert Lesson Like. Title Terms Here Lesson Quiz: Part 2 6. Write an expression for the perimeter of the given figure created using algebra tiles. 8 x + 4 Course 2

2 -9 Combining Insert Lesson Like. Title Terms Here Lesson Quiz: Part 2 7. Write an expression for the area of the given figure created using algebra tiles. x 2 + 2 x + 2 Course 2

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