1-3 Square Roots. Warm Up Lesson Presentation Lesson Quiz. Holt Algebra 2 2
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1 1-3 Square Roots Warm Up Lesson Presentation Lesson Quiz 2
2 Warm Up Round to the nearest tenth Find each square root Write each fraction in simplest form Simplify
3 Objectives Estimate square roots. Simplify, add, subtract, multiply, and divide square roots.
4 Vocabulary radical symbol radicand principal root rationalize the denominator like radical terms
5 The side length of a square is the square root of its area. This relationship is shown by a radical symbol. The number or expression under the radical symbol is called the radicand. The radical symbol indicates only the positive square root of a number, called the principal root. To indicate both the positive and negative square roots of a number, use the plus or minus sign (±). or 5
6 Numbers such as 25 that have integer square roots are called perfect squares. Square roots of integers that are not perfect squares are irrational numbers. You can estimate the value of these square roots by comparing them with perfect squares. For example, lies between and, so it lies between 2 and 3.
7 Estimate Example 1: Estimating Square Roots to the nearest tenth. < < 5 < < 6 Find the two perfect squares that 27 lies between. Find the two integers that lies between. Because 27 is closer to 25 than to 36, is close to 5 than to 6. Try 5.2: = Too high, try = Too low Because 27 is closer to than 26.01, is closer to 5.2 than to 5.1. Check On a calculator to the nearest tenth rounded
8 Check It Out! Example 1 Estimate to the nearest tenth. < < 7 < < 8 Find the two perfect squares that 55 lies between. Find the two integers that lies between. Because 55 is closer to 49 than to 64, is closer to 7 than to 8. Try 7.2: = Too low, try = Too low but very close Because 55 is closer to than 51.84, is closer to 7.4 than to 7.2. Check On a calculator rounded to the nearest tenth.
9 Square roots have special properties that help you simplify, multiply, and divide them.
10
11 Notice that these properties can be used to combine quantities under the radical symbol or separate them for the purpose of simplifying square-root expressions. A square-root expression is in simplest form when the radicand has no perfect-square factors (except 1) and there are no radicals in the denominator.
12 Example 2: Simplifying Square Root Expressions Simplify each expression. A. Find a perfect square factor of 32. Product Property of Square Roots B. Quotient Property of Square Roots
13 Example 2: Simplifying Square Root Expressions Simplify each expression. C. Product Property of Square Roots D. Quotient Property of Square Roots
14 Check It Out! Example 2 Simplify each expression. A. Find a perfect square factor of 48. Product Property of Square Roots B. Quotient Property of Square Roots Simplify.
15 Check It Out! Example 2 Simplify each expression. C. Product Property of Square Roots D. Quotient Property of Square Roots
16 If a fraction has a denominator that is a square root, you can simplify it by rationalizing the denominator. To do this, multiply both the numerator and denominator by a number that produces a perfect square under the radical sign in the denominator.
17 Example 3A: Rationalizing the Denominator Simplify by rationalizing the denominator. Multiply by a form of 1. = 2
18 Example 3B: Rationalizing the Denominator Simplify the expression. Multiply by a form of 1.
19 Check It Out! Example 3a Simplify by rationalizing the denominator. Multiply by a form of 1.
20 Check It Out! Example 3b Simplify by rationalizing the denominator. Multiply by a form of 1.
21 Square roots that have the same radicand are called like radical terms. To add or subtract square roots, first simplify each radical term and then combine like radical terms by adding or subtracting their coefficients.
22 Example 4A: Adding and Subtracting Square Roots Add.
23 Example 4B: Adding and Subtracting Square Roots Subtract. Simplify radical terms. Combine like radical terms.
24 Add or subtract. Check It Out! Example 4a Combine like radical terms.
25 Add or subtract. Check It Out! Example 4b Simplify radical terms. Combine like radical terms.
26 Lesson Quiz: Part I 1. Estimate to the nearest tenth. 6.7 Simplify each expression
27 Lesson Quiz: Part II Simplify by rationalizing each denominator Add or subtract
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