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Section 2-8

Section 2-8. Definitions Square root : = 6. Radical sign : This is a radical sign. Perfect square : 4, 9, 16, 25, … are perfect square numbers. Because 2*2=4, 3*3=9, 4*4=16, 5*5=25, …. Section 2-8 definitions cont.

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Section 2-8

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  1. Section 2-8 Definitions Square root: = 6. Radical sign: This is a radical sign. Perfect square: 4, 9, 16, 25, … are perfect square numbers. Because 2*2=4, 3*3=9, 4*4=16, 5*5=25, …

  2. Section 2-8 definitions cont. • Irrational number: is a number that cannot be expressed in the form of which is a fraction. • Example: = 10.95445115…, since this is not a repeating or terminating decimal, this number is irrational. • Real numbers: are the set of rational and the set of irrational numbers together. See whiteboard Venn diagram

  3. Section 2-8 examples • Find the following square roots: 1.) 2.) - 3.) Answers: 1.) 4 2.) -7 3.) 11 Name the set or sets of numbers which each number belongs to. Use N for natural numbers, W for whole numbers, Z for integers, Q for rational Numbers, and I for irrational numbers. 4.) - 5.) 0 6.) 8/4 Answers: 4.) Z, Q 5.) W, Z, Q 6.) N, W, Z, Q

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