# 1.1. Basic Concepts. Write sets using set notation. Write sets using set notation. Write sets using set notation. Write sets using set notation.

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1 1.1 Basic Concepts Write sets using set notation. Objectives A set is a collection of objects called the elements or members of the set Write sets using set notation. Use number lines. Know the common sets of numbers. Find the additive inverses. Use absolute value. Use inequality symbols. Graph sets of real numbers. In algebra, the elements of a set are usually numbers. Set braces, { }, are used to enclose the elements. Since we can count the number of elements in the set {1, 2, 3}, it is a finite set. The set N = {1, 2, 3, 4, 5, 6 } is called the natural numbers, or counting numbers. The three dots (ellipsis points) show that the list continues in the same pattern indefinitely. We cannot list all the elements of the set of natural numbers, so it is an infinite set. Slide Write sets using set notation. When 0 is included with the set of natural numbers, we have the set of whole numbers, written W = {0, 1, 2, 3, 4, 5, 6 }. The set containing no elements, such as the set of whole numbers less than 0, is called the empty set, or null set, usually written or { }. To write the fact that 2 is an element of the set {1, 2, 3}, we use the symbol (read is an element of ). 2 {1, 2, 3} Write sets using set notation. Two sets are equal if they contain exactly the same elements. For example, {1, 2} = {2, 1} (Order does not matter.) {0, 1, 2} {1, 2} ( means is not equal to ), since one set contains the element 0 while the other does not. Letters called variables are often used to represent numbers or to define sets of numbers. For example, {x x is a natural number between 3 and 15} (read the set of all elements x such that x is a natural number between 3 and 15 } defines the set {4, 5, 6, 7, 14}. Do not write { } for the empty set. { } is a set with one element:. Use the notation or { } for the empty set. Slide Slide Write sets using set notation. EXAMPLE 1 Listing the Elements in Sets The notation {x x is a natural number between 3 and 15} is an example of set-builder notation. List the elements in { x x is a natural number greater than 12 }. {x x has property P} {13, 14, 15, } the set of all elements of x such that x has a given property P Slide Slide

2 EXAMPLE 2 Use set builder notation to describe the set. { 0, 1, 2, 3, 4, 5 } Using Set-Builder Notation to Describe Sets { x x is a whole number less than 6 } Use number lines. A good way to get a picture of a set of numbers is to use a number line. The number 0 is neither positive nor negative. Negative numbers Positive numbers The set of numbers identified on the number line above, including positive and negative numbers and 0, is part of the set of integers, written I = {, 3, 2, 1, 0, 1, 2, 3 }. Slide Slide Use number lines. Use number lines. Each number on a number line is called the coordinate of the point that it labels while the point is the graph of the number. Graph of 1 3/4 The set of rational numbers includes the natural numbers, whole numbers, and integers, since these numbers can be written as fractions. For example, Coordinate A rational number written as a fraction, such as ½ or 1/8, can also be expressed as a decimal by dividing the numerator by the denominator. The fraction ¾ graphed on the number line is an example of a rational number. A rational number can be expressed as the quotient of two integers, with denominator not 0. The set of all rational numbers is written Decimal numbers that neither terminate nor repeat are not rational numbers and thus are called irrational numbers. For example, Slide Slide Know the common sets of numbers. Use number lines. Sets of Numbers Natural numbers, or counting numbers Whole numbers Integers {1, 2, 3, 4, 5, 6, } {0, 1, 2, 3, 4, 5, 6, } {, 3, 2, 1, 0, 1, 2, 3, } Rational numbers Irrational numbers Real numbers {x x is a real number that is not rational} {x x is a rational number or an irrational number} Slide Slide

3 EXAMPLE 3 Select all the sets from the following list that apply to each number whole number integer rational number irrational number real number Identifying Examples of Number Sets Identifying Examples of Number Sets (cont d) EXAMPLE 3 Select all the sets from the following list that apply to each number whole number integer rational number irrational number real number Slide Slide Identifying Examples of Number Sets (cont d) EXAMPLE 3 Select all the sets from the following list that apply to each number whole number integer rational number irrational number real number Determining Relationships Between Sets of Numbers EXAMPLE 4 Decide whether the statement is true or false. If it is false, tell why. Some integers are whole numbers. true Every real number is irrational. false; some real numbers are irrational, but others are rational numbers. Slide Slide Find the additive inverses. Find the additive inverses. Additive Inverse For any real number a, the number a is the additive inverse of a Uses of the Symbol The symbol is used to indicate any of the following: 1. a negative number, such as 9 or 15; 2. the additive inverse of a number, as in 4 is the additive inverse of 4 ; 3. subtraction, as in Additive inverses (opposite) Change the sign of a number to get its additive inverse. The sum of a number and it additive inverse is always 0. For any real number a, ( a) = a. ( a) Slide Slide

4 Use absolute value. Use absolute value. The absolute value of a number a, written a, is the distance on a number line from 0 to a. Absolute Value For example, the absolute value of 5 is the same as the absolute value of 5 because each number lies 5 units from 0. For any real number a, a = Distance is 5, so 5 = 5. Distance is 5, so 5 = 5. Because absolute value represents distance, and distance is never negative, the absolute value of a number is always positive or 0. Slide Slide Finding Absolute Value EXAMPLE 5 Simplify by finding each absolute value. 3 = 3 Comparing Rates of Change in Industries EXAMPLE 6 Of the customer service representatives and sewing machine operators, which will show the greater change (without regard to sign)? 3 = 3 3 = = = 9 Look for the number with the largest absolute value. 8 1 = 7 = 7 sewing machine operators Slide Slide Use inequality symbols. Use inequality symbols. The statement = 6 Inequalities on a Number Line is an equation a statement that two quantities are equal. The statement 4 6 (read 4 is not equal to 6 ) is an inequality a statement that two quantities are not equal. On a number line, a < b if a is to the left of b; a > b if a is to the right of b. You can use a number line to determine order. The symbol < means is less than. 8 < 9, 7 < 16, 8 < 2, and 0 < 4/3 The symbol > means is greater than. 9 < 2 2 > 5 or 5 < 2 13 > 8, 8 > 2, 3 > 7 and 5/3 > 0 Be careful when ordering negative numbers. Slide Slide

5 EXAMPLE 7 Determining Order on a Number Line Use a number line to determine whether each statement is true or false. 8 > 4 9 < 2 False Use inequality symbols. In addition to the symbols, <, and >, the symbols and are often used. Symbol Meaning Example is not equal to 3 7 < is less than 4 < 1 > is greater than 3 > 2 is less than or equal to 6 6 is greater than or equal to 8 10 True Slide Slide EXAMPLE 8 Using Inequality Symbols Graph sets of real numbers. Determine whether each statement is true or false. Inequality symbols and variables are used to write sets of real numbers. For example, the set {x x > 2} 2 3 false consists of all the real numbers greater than (4) > 2(6) true true false On a number line, we graph the elements of this set by drawing an arrow from 2 to the right. We use a parenthesis at 2 to indicate that 2 is not an element of the given set. ( The set of numbers greater than 2 is an example of an interval on the number line. Slide Slide Graph sets of real numbers. To write intervals, use interval notation. The interval of all numbers greater than 2, would be ( 2, ). The infinity symbol ( ) does not indicate a number; it shows that the interval includes all real numbers greater than 2. The left parenthesis indicated that 2 is not included. A parenthesis is always used next to the infinity symbol. The set of real numbers is written in interval notation as (, ). EXAMPLE 9 Write in interval notation and graph. {x x < 5} The interval is the set of all real numbers less than 5. (, 5) Graphing an Inequality Written in Interval Notation ) Slide Slide

6 EXAMPLE 10 Write in interval notation and graph. {x x 0} Graphing an Inequality Written in Interval Notation The interval is the set of all real numbers greater than or equal to 0. We use a square bracket [ since 0 is part of the set. Graph sets of real numbers. Sometimes we graph sets of numbers that are between two given numbers. For example: {x 2 < x < 8} This is called a three-part inequality, is read 2 is less than x and x is less than 8 or x is between 2 and 8. [0, ) [ Slide Slide EXAMPLE 11 Graphing a Three-Part Inequality Write in interval notation and graph. {x x 4 x < 2} Use a square bracket at 4. Use a parenthesis at 2. [ 4, 2) [ ) Slide

9 Multiply real numbers. Recall that the answer to a multiplication problem is called the product. Multiplying Real Numbers EXAMPLE 6 Find each product. 7( 2) Multiplying Real Numbers = 14 Different signs; product is negative. Same Sign positive. The product of two numbers with the same sign is 0.9( 15) = 13.5 Same signs; product is positive. Different Signs negative. The product of two numbers with different signs is = 10 Different signs; product is negative. Slide Slide Find reciprocals and divide real numbers. Find reciprocals and divide real numbers. The definition of division depends on the idea of a multiplicative inverse, or reciprocal. Reciprocal Reciprocals have a product of 1. Number Reciprocal The reciprocal of a nonzero number None A number and its additive inverse have opposite signs. However, a number and its reciprocal always have the same sign. Division by 0 is undefined, whereas dividing 0 by a nonzero number gives the quotient 0. Slide Slide Find reciprocals and divide real numbers. The result of dividing one number by another is called the quotient. Division For all real numbers a and b (where b 0), EXAMPLE 7 Find each quotient. Dividing Real Numbers Same signs; quotient is positive. a b = That is, multiply the first number (the dividend) by the reciprocal of the second number (the divisor). The reciprocal of 11/16 is 16/11. Dividing Real Numbers Same Sign The quotient of two nonzero real numbers with the same sign is positive. Multiply by the reciprocal. Different Signs The product of two nonzero real numbers with different signs is negative. Slide Slide

10 1.3 Exponents, Roots, and Order of Operations Use exponents. Objectives 1 Use exponents. In algebra we use exponents as a way of writing products of repeated factors Find square roots. Use the order of operations. Evaluate algebraic expressions for given values of variables. The number 5 shows that 2 is used as a factor 5 times. The number 5 is the exponent, and 2 is the base. 2 5 Exponent Base Slide Use exponents. Exponential Expression If a is a real number and n is a natural number, then a n = a a a a, n factors of a where n is the exponent, a is the base, and a n is an exponential expression. Exponents are also called powers. EXAMPLE 1 Write using exponents. Here, Using Exponential Notation is used as a factor 4 times. 4 factors of Read as to the fourth power. Slide Slide Using Exponential Notation (cont d) EXAMPLE 1 ( 10)( 10)( 10) ( 10) 3 Read as 10 cubed. EXAMPLE 2 Evaluate. 3 4 ( 3) 2 Evaluating Exponential Expressions 3 is used as a factor 4 times. The base is There are no parentheses. The exponent 2 applies only to the number 3, not to 3. Slide Slide

11 Use exponents. Sign of an Exponential Expression The product of an odd number of negative factors is negative. The product of an even number of negative factors is positive. Find square roots. The opposite (inverse) of squaring a number is called taking its square root. The square root of 49 is 7. Another square root of 49 is 7, since ( 7) 2 = 49. It is important to distinguish between a n and ( a) n. n factors of a The base is a. Thus 49 has two square roots: 7 and 7. We write the positive or principal square root of a number with the symbol, called a radical symbol. The base is a. n factors of a Be careful when evaluating an exponential expression with a negative sign. Slide Slide Find square roots. The negative square root of 49 is written Finding Square Roots EXAMPLE 3 Find each square root that is a real number. Since the square of any nonzero real number is positive, the square root of a negative number, such as is not a real number. The symbol is used only for the positive square root, except that The symbol is used for the negative square root. Not a real number, because the negative sign is inside the radical sign. No real number squared equals 49. Slide Slide Use the order of operations. Use the order of operations. Order of Operations 1. Work separately above and below any fraction bar. 2. If grouping symbols such as parentheses ( ), brackets [ ], or absolute value bars are present, start with the innermost set and work outward. 3. Evaluate all powers, roots, and absolute values. 4. Multiply or divide in order from left to right. Some students like to use the mnemonic Please Excuse My Dear Aunt Sally to help remember the rules for order of operations. Please Excuse My Dear Aunt Sally 5. Add or subtract in order from left to right. Parentheses Exponents Multiply Divide Add Subtract Be sure to multiply or divide in order from left to right. Then add or subtract in order from left to right. Slide Slide

12 EXAMPLE 4 Using Order of Operations EXAMPLE 5 Using Order of Operations Simplify. Simplify = Multiply. = Multiply. = 53 Add. (4 + 2) 3 2 (8 3) 3 2 = 3 3 not 3 2 = Perform operations inside parentheses. = Evaluate the power. = 3 5 Subtract 6 9. = 8 Subtract. = Divide. = 4 6 Multiply. = 2 Subtract. Slide Slide EXAMPLE 6 Simplify. Using the Order of Operations Evaluate algebraic expressions for given values of variables. Any sequence of numbers, variables, operation symbols, and/or grouping symbols formed in accordance with the rules of algebra is called an algebraic expression. Work separately above and below the fraction bar. Evaluate the root and the power. 6ab, 5m 9n, and 2(x 2 + 4y) We evaluate algebraic expressions by substituting given values for the variables. Multiply the fraction and whole number. Subtract and add in the numerator. Multiply 3(4). Slide Slide Evaluating Algebraic Expressions EXAMPLE 7 Evaluate the expression if w = 4, x = 12, y = 64 and z = 3. EXAMPLE 7 Evaluating Algebraic Expressions (cont d) Evaluate the expression w 2 + 2z 3 if w = 4, x = 12, y = 64 and z = 3. = (4) 2 + 2( 3) 3 = ( 27) Substitute w = 4 and z = 3. Evaluate the powers. Substitute x = 12, y = 64 and z = 3. Work separately above and below the fraction bar. = = 38 Multiply. Subtract. Slide Slide

13 1.4 Properties of Real Numbers Objectives 1 Use the distributive property. Use the distributive property. The Distributive Property For any real numbers, a, b, and c, the following are true. 2 Use the identity properties. a(b + c) = ab + ac and (b + c)a = ba + ca Use the inverse properties. Use the commutative and associative properties. Use the multiplication property of 0. The distributive property can be extended to more than two numbers and provides a way to rewrite a product as a sum. a(b + c + d) = ab + ac + ad When we rewrite a(b + c) as ab + ac, we sometimes refer to the process as removing or clearing parentheses. Slide EXAMPLE 1 Use the distributive property to rewrite each expression. 4(p 5) Using the Distributive Property = 4p ( 4)(5) = 4p + 20 Using the Distributive Property (cont d) EXAMPLE 1 2r + 3s Because there is no common number or variable here, we cannot use the distributive property to rewrite the expression. 5(4p 2q + r) 6m + 2m = ( 6 + 2)m = 6m + 2m = 4m = 5(4p) 5(2q) + 5r = 20p 10q + 5r Slide Slide Use the identity properties. The number 0 is the only number that can be added to any number and leaves the number unchanged. Thus, zero is called the identity element for addition, or the additive identity. Similarly, the number 1 is the only number that can be multiplied with another number and leaves the number unchanged. Thus, one is called the identity element for multiplication or the multiplicative identity. Identity Properties For any real number a, the following are true. a + 0 = 0 + a = a a 1 = 1 a = a EXAMPLE 2 Simplify each expression. x 3x = 1x 3x = 1x 3x Identity property. = (1 3)x Distributive property. = 2x Subtract inside parentheses. (3 + 4p) = 1(3 + 4p) Using the Identity Property 1 a = a = 1(3) + ( 1)(4p) Identity property. Slide = 3 4p Multiply. Slide

14 Use the inverse properties. The additive inverse (or opposite) of a number a is a. Additive inverses have a sum of 0. The multiplicative inverse (or reciprocal) of a number a is Multiplicative inverses have a product of 1. Inverse Properties For any real number a, the following are true. a + ( a) = 0 and a + a = 0 and Use the inverse properties. A term is a number or the product of a number and one or more variables raised to powers. The numerical factor in a term is called the numerical coefficient, or just the coefficient. Terms with exactly the same variables raised to exactly the same powers are called like terms. 5y and 21y 6x 2 and 9x 2 Like terms 3m and 16x 7y 3 and 3y 2 Unlike terms Remember that only like terms may be combined. The inverse properties undo addition or multiplication. Slide Slide Use the commutative and associative properties. Commutative and Associative Properties For any real numbers a, b, and c, the following are true. Using the Commutative and Associative Properties EXAMPLE 3 Simplify. 12b 9 + 4b 7b + 1 a + b = b + a ab = ba Commutative properties = (12b + 4b) 9 7b + 1 The order of the two terms or factors changes. = (12 + 4)b 9 7b + 1 a + (b + c) = (a + b) + c a(bc) = (ab)c Associative properties = 16b 9 7b + 1 = (16b 7b) The grouping among the terms or factors changes, but the order stays the same. = (16 7)b = 9b 8 Slide Slide EXAMPLE 4 Simplify each expression. 12b 9b + 5b 7b Using the Properties of Real Numbers = ( )b Distributive property. = b Combine like terms. EXAMPLE 4 4m(2n) Using the Properties of Real Numbers (cont d) = (4)(2)mn = 8mn 6 (2x + 7) 3 = 6 2x 7 3 Distributive property. = 2x Commutative property. = 2x 4 Combine like terms. Slide Slide

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