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2 MA131 - Analysis 1 Workbook 1 Inequalities Autumn 2013 Contents 1 Inequalities What are Inequalities? Using Graphs Case Analysis Taking Powers Absolute Value (Modulus) The Triangle Inequality Arithmetic and Geometric Means * Archimedes and π *

3 1 Inequalities 1.1 What are Inequalities? An inequality is a statement involving one of the order relationships <, >,,. Inequalities can be split into two types: (i) those whose truth depends on the value of the variables involved, e.g. x 2 > 4 is true if and only if x < 2 or x > 2; (ii) those which are always true, e.g. (x 3) 2 + y 2 0 is true for all real values of x and y. We begin here by looking at how to deal with inequalities of the first type. Later on in sections 1.6 and 1.7 we will see some examples of the second type. With the first type of inequality our task is usually to find the set of values for which the inequality is true; this is called solving the inequality. The set we find is called the solution set and the numbers in the set are called solutions. The basic statement x < y can be interpreted in two simple ways. { The point representing x on the standard number line is to the left of the x < y y x is positive point representing y. It can be shown that with this interpretation we have the following familiar basic rules for manipulating inequalities based on <. Similar definitions and rules apply to >,, and. Rule Example (based on < ) Adding the same number to each side x < y x + a < y + a preserves the inequality. Caution 0 is not a positive number Remember these rules These rules are important. You should know them by heart. Multiplying both sides by a positive number preserves the inequality. Multiplying both sides by a negative number reverses the inequality. Inequalities of the same type are transitive. If a is positive then x < y = ax < ay If b is negative then x < y = bx > by x < y and y < z = x < z. We solve an inequality involving variables by finding all the values of those variables that make the inequality true. Some solutions are difficult to find and not all inequalities have solutions. Exercise 1 1. Show that x = 0 is a solution of (x 2)(x 4) (x+3)(x 7) < Solve the inequalities: (a) x 2 > 4; (b) x x; (c) 2 < 3 2x < Write down an inequality that has no solution. 1

4 1.2 Using Graphs Graphs can often indicate the solutions to an inequality. The use of graphs should be your first method for investigating an inequality. Exercise 2 Draw graphs to illustrate the solutions of the following inequalities. 1. x 3 < x; 2. 1/x < x < 1. In the second case you will need to plot the graphs of y = 1/x, y = x and y = Case Analysis You solve inequalities by using the basic rules given in section 1.1. When solving inequalities which involve products, quotients and modulus signs (more on these later) you often have to consider separate cases. Have a good look at the following examples. Examples 1. Solve x 2 < 1. First we notice that x 2 < 1 x 2 1 < 0 (x + 1)(x 1) < 0. We can see at once that there are two possible cases: (a) x + 1 > 0 and x 1 < 0 x > 1 and x < 1 1 < x < 1; (b) x + 1 < 0 and x 1 > 0 x < 1 and x > 1 Impossible! Products The product xy of two real numbers is positive if and only if x and y are either both positive or both negative. Their product is negative if and only if they have opposite signs. It follows that 1 < x < 1. 2

5 2. Solve 1 x + 1 x+1 > 0. To get an idea of the solutions of this inequality it is a good idea to draw Sign Language graphs of 1 1 We use the double implication x and x+1 on the same axis because 1 x + 1 x+1 > 0 1 x < 1 x+1. sign ( ) to ensure that we It is useful to note that 1 x + 1 x+1 = 2x+1 x(x+1). We look for the points where find only the solution set and the denominator changes sign (at x = 1 and x = 0) and choose our cases not some larger set to which it accordingly. For the values x = 0 or x = 1 the inequality is meaningless belongs. For instance, suppose so we rule these values out straight away. we wished to solve 2x < 1. We could quite correctly write (a) Consider only x < 1. In this case x and x + 1 are negative and x(x + 1) is positive. So 2x+1 2x < 1 = 2x < 0 x(x+1) > 0 2x + 1 > 0 x > 1/2 which is impossible for this case. = x < 0, (b) Consider only 1 < x < 0. Then x(x + 1) is negative so 2x+1 x(x+1) > 0 2x + 1 < 0 x < 1/2. So we have solutions for the x under consideration exactly when 1 < x < 1/2. (c) Consider only x > 0. Then x(x + 1) is positive so as in case 1 we require x > 1/2. So the solutions for those x under consideration are exactly x > 0. It follows that the solution set is exactly those x such that either 1 < x < 1/2 or x > 0. but clearly it is not true that x < 0 = 2x < 1. Assignment 1 1. Solve the inequality 1/x < x < 1 by Case Analysis. (You solved it earlier by plotting a graph.) 2. Consider the following argument: 1 x < x < 1 1 < x 2 1 < x. Therefore v Implies The two symbols and = do not mean the same thing, though you may be used to using them interchangeably. Suppose P 1 and P 2 are two propositions. The argument P 1 P 2 means P 1 is true and therefore P 2 is true. However, P 1 = P 2 means If P 1 is true then P 2 is true. But x < 1, therefore there are no solutions. How many mistakes can you find? Comment on this solution as though you were a teacher and it was written by one of your students. 1.4 Taking Powers Assignment 2 Is the following statement true for all x and y: If x < y then x 2 < y 2? What about this statement: If x 2 < y 2 then x < y? 3

6 You probably suspect that the following is true: Power Rule If x and y are positive real numbers then, for each natural number n, x < y if and only if x n < y n. Example This is another way of saying that if x is positive then the function x n is strictly increasing. We would like to prove this useful result. Of course we are looking for an arithmetic proof that does not involve plotting graphs of functions but uses only the usual rules of arithmetic. The proof must show both that x < y = x n < y n and that x n < y n = x < y. Notice that these are two different statements. Assignment 3 1. Use mathematical induction to prove that if both x and y are positive then x < y = x n < y n. 2. Now try to prove the converse, that if both x and y are positive then x n < y n = x < y. If inspiration doesn t strike today, stay tuned during Foundations, especially when the word contrapositive is mentioned. Caution The Power Rule doesn t work if x or y are negative. Contrapositive The contrapositive of the statement p = q is the statement not q = not p. These are equivalent, but sometimes one is easier to prove than the other. 1.5 Absolute Value (Modulus) At school you were no doubt on good terms with the modulus, or absolute value, sign and were able to write useful things like 2 = 2 and 2 = 2. What you may not have seen written explicitly is the definition of the absolute value, also known as the absolute value function. Definition x = { x if x 0 x if x < 0 4

7 Exercise 3 1. Check that this definition works by substituting in a few positive and negative numbers, not to mention zero. 2. Plot a graph of the absolute value function. Proposition The following are key properties of the absolute value function. 1. x = x. 2. xy = x y. 3. x y = x y. Proof. It is easy to prove 1. directly from the definition since x in the left hand side is always positive. To prove 2. we consider the three cases, where one of x or y is negative and the other is positive, where both are positive, and when both are negative. For example, if both x and y are negative then xy is positive and xy = xy = x ( y ) = x y. The proof of 3. uses the fact that 1 = x 1 x = 1 = x 1 by 2. x = 1 x = 1 x. Now we can write x y = x 1 y = x 1 y = x y. Assignment 4 Rewrite each of the following expressions without absolute value signs, treating various cases separately where necessary. 1. a (a a ). 2. ( x 2). In Analysis, intervals of the real line are often specified using absolute values. The following result makes this possible: Theorem Interval Property If x and b are real numbers and b > 0, then x < b if and only if b < x < b. Proof. Suppose x < b. For x 0 this means that x < b and for x < 0 this means that x < b which is the same as x > b. Together these prove half the result. Now suppose b < x < b. Then b < x < b if x 0 by definition. If x < 0 then b < x < b and it follows again that b < x < b. 5

8 Corollary If y, a and b are real numbers and b > 0, then y a < b if and only if a b < y < a + b. Proof. Substitute x = y a in the interval property. This corollary justifies the graphical way of thinking of the modulus sign a b as the distance along the real line between a and b. This can make solving simple inequalities involving the absolute value sign very easy. To solve the inequality x 3 < 1 you need to find all the values of x that are within distance 1 from the number 3, i.e. the solution set is 2 < x < 4. Exercise 4 Solve the inequalities: 1. x 2 > 1; 2. x + 5 < 3; 3. 6x 12 > 3. [Hint: don t forget that x + 5 = x ( 5) is just the distance between x and 5 and that 6x 12 = 6 x 2 is just six times the distance between x and 2.] 6

9 If the above graphical methods fail then expressions involving absolute values can be hard to deal with. Two arithmetic methods are to try to get rid of the modulus signs by Case Analysis or by squaring. We illustrate these methods in the following very simple example. Example Solve the inequality x + 4 < 2. Squaring: 0 x + 4 < 2 (x + 4) 2 < 4 x 2 + 8x + 16 < 4 x 2 + 8x + 12 < 0 (x + 2)(x + 6) < 0 6 < x < 2. Squaring The method of squaring depends upon the equivalence: if b > a 0, then a < x < b a 2 < x 2 < b 2 Case Analysis: 1. Consider x > 4. Then x + 4 < 2 x + 4 < 2 x < 2. So solutions for this case are 4 < x < Consider x 4. Then x + 4 < 2 x 4 < 2 x > 6. So solutions for this case are 6 < x 4. So the solution set is 6 < x < 2. Assignment 5 Solve the following inequalities: 1. x 1 + x 2 5; 2. x 1 x + 1 > The Triangle Inequality Here is an essential inequality to put in your mathematical toolkit. It comes in handy in all sorts of places. The Triangle Inequality For all real numbers x and y, x + y x + y. Assignment 6 1. Put a variety of numbers into the Triangle Inequality and convince yourself that it really works. 2. Write out the triangle inequality when you take x = a b and y = b c. 3. Prove the Triangle Inequality. [Hint: Square both sides.] Dummy Variables The Triangle Inequality holds for all values, so you can stick into it any numbers or variables you like. The x and y are just dummies. Have A Go You can also prove the Triangle Inequality by Case Analysis. The proof is longer, but it is a good test of whether you can really handle inequalities. 7

10 1.7 Arithmetic and Geometric Means Given two numbers a and b the arithmetic mean is just the average value that you are used to, namely (a+b)/2. Another useful average of two positive values is given by the geometric mean. This is defined to take the value ab. Exercise 5 Calculate the arithmetic and the geometric mean for the numbers 0, 10 and 1, 9 and 4, 6 and 5, 5. Assignment 7 1. Show, for positive a and b, that a+b 2 ab = ( a b) Show that the arithmetic mean is always greater than or equal to the geometric mean. When can they be equal? Definition Suppose we have a list of n positive numbers a 1, a 2,..., a n. We can define the arithmetic and geometric means by: Arithmetic Mean = a1+a2+...+an n ; Geometric Mean = n a 1 a 2...a n. Exercise 6 1. Calculate both means for the numbers 1, 2, 3 and for 2, 4, It is a true inequality that the arithmetic mean is always greater than or equal to the geometric mean. There are many proofs, none of them are completely straightforward. Puzzle for a while to see if you can prove this result. Let your class teacher know if you succeed. [Hint: The case n = 4 is a good place to start.] 1.8 * Archimedes and π * Archimedes used the following method for calculating π. The area of a circle of radius 1 is π. Archimedes calculated the areas A n = area of the circumscribed regular polygon with n sides, a n = area of the inscribed regular polygon with n sides. The area of the circle is between that of the inscribed and circumscribed polygons, so a n π A n for any n. Archimedes claimed that the following two formulae hold: a 2n = a n A n ; A 2n = 2A na 2n A n + a 2n. 8

11 circ insc Exercise 7 What are the values of A 4 and a 4? Use Archimedes formulae and a calculator to find a 8, A 8, a 16, A 16, a 32, A 32, a 64, A 64. How many digits of π can you be sure of? To prove the formulae, Archimedes used geometry, but we can find a short proof using trigonometry. Exercise 8 Use trigonometry to show that A n = n tan ( π n) and an = n 2 sin ( ) 2π n. Now use the double angle formulae to prove Archimedes formulae. Check Your Progress By the end of this Workbook you should be able to: Solve inequalities using case analysis and graphs. Define the absolute value function and manipulate expressions containing absolute values. Interpret the set {x : x a < b} as an interval on the real line. Prove that if x and y are positive real numbers and n is a natural number then x y iff x n y n. State and prove the Triangle Inequality. 9

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