Download Section 2-8 - Mount Logan Middle School

Section 2-8
Definitions
Square root:
36 = 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.
Irrational number: is a number
that cannot be
a
expressed in the form of b which is a fraction.
Example: 120 = 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
Section 2-8 examples
Find the following square roots:
1.) 16
2.) - 49
Answers: 1.) 4
3.)
2.) -7
121
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.) - 36
5.) 0
Answers: 4.) Z, Q
6.) 8/4
5.) W, Z, Q
6.) N, W, Z, Q