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Section I: Distributive Property Section II: Order of Operations

Section I: Distributive Property Section II: Order of Operations. Objective. Section I: The Distributive Property. Use the distributive property to simplify expressions. The process of distributing the number on the outside of the parentheses to each term on the inside .

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Section I: Distributive Property Section II: Order of Operations

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  1. Section I: Distributive PropertySection II: Order of Operations

  2. Objective Section I: The Distributive Property Use the distributive property to simplify expressions.

  3. The process of distributing the number on the outside of the parentheses to each term on the inside. a(b + c) = ab + ac and (b + c) a = ba + ca a(b - c) = ab - ac and (b - c) a = ba - ca Example #1 5(x + 7) 5  x + 5  7 5x + 35

  4. Example #2 3(m - 4) 3  m - 3 4 3m - 12 Example #3 -2(y + 3) -2 y + (-2) 3 -2y + (-6) -2y - 6

  5. Which statement demonstrates the distributive property incorrectly? • 3(x + y + z) = 3x + 3y + 3z • (a + b) c = ac + bc • 5(2 + 3x) = 10 + 3x • 6(3k - 4) = 18k - 24

  6. Answer Now Which statement demonstrates the distributive property incorrectly? • 3(x + y + z) = 3x + 3y + 3z • (a + b) c = ac + bc • 5(2 + 3x) = 10 + 3x • 6(3k - 4) = 18k - 24

  7. A term is a 1) number, or 2) variable, or 3) a product (quotient of numbers and variables). Example 5 m 2x2

  8. 3) The coefficient is the numerical part of the term. Examples • 4a 4 2) y2 1

  9. Like Termsare terms with the same variable AND exponent. To simplify expressions with like terms, simply combine the like terms.

  10. Are these like terms? 1) 13k, 22k Yes, the variables are the same. 2) 5ab, 4ba Yes, the order of the variables doesn’t matter. 3) x3y, xy3 No, the exponents are on different variables.

  11. are like terms and 5a and a are like terms The above expression simplifies to:

  12. Simplify1) 5a + 7a 12a 2) 6.1y - 3.2y 2.9y 3) 4x2y + x2y 5x2y 4) 3m2n + 10mn2 + 7m2n - 4mn2 10m2n + 6mn2

  13. 7) y 5) 13a + 8a + 6b 21a + 6b 6) 4d + 6a2 - d + 12a2 18a2 + 3d

  14. Section II: Order of Operations Objective:Use the order of operations to evaluate expressions

  15. Simple question: 7 + 43=? Is your answer 33 or 19? You can get 2 different answers depending on which operation you did first. We want everyone to get the same answer so we must follow the order of operations.

  16. ORDER OF OPERATIONS 1. Parentheses - ( ) or [ ] 2. Exponents or Powers 3. Multiply and Divide (from left to right) 4. Add and Subtract (from left to right)

  17. Once again, evaluate 7 + 4 x3 and use the order of operations. = 7 + 12 (Multiply.) =19(Add.)

  18. Example #114 ÷ 7 x 2 - 3 = 2x 2 - 3 (Divide) = 4 - 3 (Multiply) = 1(Subtract)

  19. Example #23(3 + 7) 2 ÷ 5 = 3(10) 2 ÷ 5 (parentheses) = 3(100) ÷ 5 (exponents) = 300 ÷ 5 (multiplication) =60 (division)

  20. Example #320 - 3 x 6 + 102 + (6 + 1) x 4 = 20 - 3 x 6 + 102 + (7) x 4 (parentheses) = 20 - 3 x 6 + 100 + (7) x 4 (exponents) = 20 - 18 + 100 + (7) x 4 (Multiply) = 20 - 18 + 100 + 28 (Multiply) = 2 + 100 + 28 (Subtract ) = 102 + 28 (Add) =130 (Add)

  21. Which of the following represents 112 + 18 - 33· 5in simplified form? • -3,236 • 4 • 107 • 16,996

  22. Which of the following represents 112 + 18 - 335in simplified form? • -3,236 • 4 • 107 • 16,996

  23. Simplify16 - 2(10 - 3) • 2 • -7 • 12 • 98

  24. Simplify16 - 2(10 - 3) • 2 • -7 • 12 • 98

  25. Simplify24 – 6 4 ÷ 2 • 72 • 36 • 12 • 0

  26. Simplify24 – 6 4 ÷ 2 • 72 • 36 • 12 • 0

  27. Evaluating a Variable ExpressionTo evaluate a variable expression: • substitute the given numbers for each variable. • use order of operations to solve.

  28. Example # 4 n + (13 - n)  5 for n = 8 = 8 + (13 - 8)  5 (Substitute.) = 8 + 5 5 (parentheses) = 8 + 1 (Divide) = 9(Add)

  29. Example # 5 8y - 3x2+ 2n for x = 5, y = 2, n =3 = 8 2- 3  52 + 2  3 (Substitute.) = 8  2 - 3  25 + 2  3 (exponents) = 16- 3  25 + 2  3 (Multiply) = 16 -75 + 2  3 (Multiply) = 16 - 75 + 6 (Multiply) = -59 + 6 (Subtract) = -53(Add)

  30. What is the value ofif n = -8, m = 4, and t = 2 ? • 10 • -10 • -6 • 6

  31. What is the value ofif n = -8, m = 4, and t = 2 ? • 10 • -10 • -6 • 6

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