Page 56 - Math Course 2 (Book 1)

Real Number System

3 2
26
Replace the • with <, >, or = to make • 7 4 Order , , , and from least
5
61
5.4
29
3
a true statement. to greatest
A. < A. 5 2 5.4 29 26
3
B. > 2
C. = B. 26 29 5 3 5.4
D. none of the above
C. 5 2 5.4 26 29
Answer 3
2
D. 26 29 5.4 5
3
Answer

MO. 2 - L2b

Square Roots: Let’s Begin

Solving Equations

Vocabulary A-Z Solve Equations

Let us learn some vocabulary
Examples

Real numbers
Solve w² = 169. Round to the nearest tenth, if
necessary.
The set of rational numbers and the set of irrational
numbers together make up the set of real numbers. w = 169 Write the equation.
2
Take the square root
w 2 = 169 of each side.

w = 169 or – 169 Find the positive and
negative square root.
w = 13 or w = –13

Answer The solutions are 13 and –13.

2
Solve r = 50. Round to the nearest tenth, if
necessary.
Key Concept r = 50 Write the equation.
2

Take the square root
Irrational Numbers r 2 = 50 of each side.

An irrational number is a number that cannot be r = 50 or – 50 Find the positive and
a negative square root.
expressed as , where a and b integers and b
b
does not equal 0. r = 7.1 or r = –7.1 Use a calculator.

Answer The solutions are 7.1 and –7.1.

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