EXAMPLE 1 Evaluating Square Roots

a. 36 = 6 6because 2

b. 64– = –8 because (–8) 2

c. 425

25= because ( )2

5

2

d. 0.81 = 0.9 because (0.9)2 = 0.81.

425

= .

= 64 .

= 36 .

EXAMPLE 2 Standardized Test Practice

SOLUTION

22

is closer to 9 or 10.

You can use a number line to approximate 95nearest whole number. Because

to theis between 9 and 10,

9595

you need to decide whetherFind 9.5. You can calculate that 9.5 = 90.25 and 95( )2= 95.

EXAMPLE 2 Standardized Test Practice

95

95

As shown on the number line, is between 90.25 and 100 , so it has a value between 9.5 and 10. Therefore,

is closer to 10 than it is to 9.

95

ANSWER

To the nearest whole number, 10.The correct answer is C.

GUIDED PRACTICE for Examples 1 and 2

Find or approximate the square root to the nearest integer.

1.

4

2. 0

ANSWER

4 = 2

ANSWER

0 0=

GUIDED PRACTICE for Examples 1 and 2

Find or approximate the square root to the nearest integer.

3.

36–

4. 81–

ANSWER

= –636–

ANSWER

81– = –9

GUIDED PRACTICE for Examples 1 and 2

Find or approximate the square root to the nearest integer.

5.

23

6. 41

ANSWER

41 = 6

ANSWER

=23 5

GUIDED PRACTICE for Examples 1 and 2

Find or approximate the square root to the nearest integer.

7.

2581

8. 0.36

ANSWER

= 1 2581

ANSWER

0.36 = 1