# 1-5 Square Roots and Real Numbers. Holt Algebra 1

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1 1-5 Square Roots and Real Numbers Warm Up Lesson Presentation Lesson Quiz

2 Bell Quiz 1-5 Evaluate 2 pts pts pts pts possible 2 pts pts

3 Questions on 0-4/0-10/0-11

4 Objectives Evaluate expressions containing square roots. Classify numbers within the real number system.

5 Vocabulary square root perfect square real numbers natural numbers whole numbers integers rational numbers terminating decimal repeating decimal irrational numbers

6 A square root is the number that is multiplied by itself to form a product. The operations of squaring and finding a square root are inverse operations. The radical symbol, is used to represent square roots. Positive real numbers have two square roots. 4 4 = 4 2 = 16 = 4 Positive square root of 16 ( 4)( 4) = ( 4) 2 = 16 = 4 Negative square root of 16

7 The nonnegative square root is represented by. The negative square root is represented by. A perfect square is a number whose positive square root is a whole number. Some examples of perfect squares are shown in the table

8 Reading Math The expression does not represent a real number because there is no real number that can be multiplied by itself to form a product of 36.

9 Example 1: Finding Square Roots of Perfect Squares Find each square root. A. B. Think: What number squared equals 16? Positive square root positive 4. Think: What is the opposite of the square root of 9? Negative square root negative 3.

10 Example 1C: Finding Square Roots of Perfect Squares Find the square root. Think: What number squared equals 25? 81 Positive square root positive. 5 9

11 Check It Out! Example 1 Find the square root. 1a. Think: What number squared equals 4? Positive square root positive 2. 1b. Think: What is the opposite of the square root of 25? Negative square root negative 5.

12 The square roots of many numbers like, are not whole numbers. A calculator can approximate the value of as Without a calculator, you can use square roots of perfect squares to help estimate the square roots of other numbers.

13 Example 2: Problem-Solving Application As part of her art project, Shonda will need to make a square covered in glitter. Her tube of glitter covers 13 square inches. What is the greatest side length Shonda s square can have? 1 Understand the problem The answer will be the side length of the square. List the important information: The tube of glitter can cover an area of 13 square inches.

14 2 Make a Plan Example 2 Continued The side length of the square is because = 13. Because 13 is not a perfect square, is not a whole number. Estimate to the nearest tenth. Find the two whole numbers that is between. Because 13 is between the perfect squares 0 and 16. is between and, or between 3 and 4.

15 Example 2 Continued Because 13 is closer to 16 than to 9, is closer to 4 than to You can use a guess-and-check method to estimate.

16 3 Solve Example 2 Continued Guess 3.6: = too low Guess 3.7: = too high is greater than 3.6. is less than Because 13 is closer to than to 13.69, is closer to 3.6 than to

17 Example 2 Continued 4 Look Back A square with a side length of 3.6 inches would have an area of square inches. Because is close to 13, 3.6 inches is a reasonable estimate.

18 Natural numbers are the counting numbers: 1, 2, 3, Whole numbers are the natural numbers and zero: 0, 1, 2, 3, Integers are whole numbers and their opposites: 3, 2, 1, 0, 1, 2, 3, Rational numbers can be expressed in the form a, b where a and b are both integers and b 0: 1, 7,

19 Terminating decimals are rational numbers in decimal form that have a finite number of digits: 1.5, 2.75, 4.0 Repeating decimals are rational numbers in decimal form that have a block of one or more digits that repeat continuously: 1.3, 0.6, 2.14 Irrational numbers cannot be expressed in the form a. They include square roots of whole b numbers that are not perfect squares and nonterminating decimals that do not repeat:,, π

20 All numbers that can be represented on a number line are called real numbers and can be classified according to their characteristics.

21 Flow Chart to Find All Classifications for All Real Numbers Start Here Look at the decimal representation of the # Neither? Irrational Term Dec? Rep Dec? Rational Yes Yes Yes Rational Integer? Whole? Natural? No No No

22 Example 3: Classifying Real Numbers Write all classifications that apply to each Real number. A can be written as a fraction and a decimal. B. 5 rational number, integer, terminating decimal 5 can be written as a fraction and a decimal. rational number, integer, whole number, natural number, terminating decimal

23 Check It Out! Example 3 Write all classifications that apply to each real number. 3a can be written as a 9 9 repeating decimal. rational number, repeating decimal 3b can be written as a fraction and a decimal. rational number, terminating decimal, integer 3c. irrational number The digits continue with no pattern.

24 HOMEWORK Sec 1-5 (Pg 35) 1-23 all, 56, 59

25 HOMEWORK

26 HOMEWORK

27 HOMEWORK

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