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Five-Minute Check (over Chapter 9) Then/Now New
Vocabulary Key Concept Square Root Example 1
Find Square Roots Example 2 Estimate Square
Roots Example 3 Use a Calculator to Estimate a
Square Root Example 4 Use a Calculator to
Estimate a Negative Square Root Example 5 Real
World Example Use Square Roots to Solve Problems
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5-Minute Check 1
Write 5 ? 5 ? a ? a ? b ? b ? b using exponents.
A. 10a2b3 B. 52a2b3 C. 10ab5 D. 5ab5
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5-Minute Check 2
Write x ? y ? x ? y ? x ? y ? x ? y using
exponents.
A. 2xy B. 4xy C. 4(xy)4 D. (xy)4
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5-Minute Check 3
Find 35 ? 34. Express using positive exponents.
A. 320 B. 310 C. 39 D. 920
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5-Minute Check 4
Find (5a2) (7a3). Express using positive
exponents.
A. 35a5 B. 12a6 C. 12a5 D. 35a5
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5-Minute Check 5

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5-Minute Check 6
Which of the following equations represents the
graph shown?
A. y 3x3 B. y 3x2 2x 2 C. y 3x 2
D. y 3x
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Then/Now
You have already evaluated expressions containing
squares of numbers. (Lesson 81)

• Find square roots.

• Estimate square roots.

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Vocabulary

• perfect square

• square root
• radical sign

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Concept
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Example 1 A
Find Square Roots
Answer 8
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Example 1 B
Find Square Roots
Answer 11
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Example 1 C
Find Square Roots
Answer 16 and 16
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Example 1 D
Find Square Roots
Answer There is no square root because no
number times itself is equal to 9.
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Example 1 CYP A
A.
A. 624 B. 12.5 C. 5 D. 5
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Example 1 CYP B
B.
A. 12 B. 12 C. 72 D. 20,736
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Example 1 CYP C
C.
A. 4 B. 4 C. 4 and 4 D. 256 and 256
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Example 1 CYP D
A. 8 B. 8 C. 32 D. There is no real square root.
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Example 2 A
Estimate Square Roots
Answer 5
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Example 2 B
Estimate Square Roots
Answer 18
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Example 2 CYP A
A.
A. 6 B. 7 C. 8 D. 9
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Example 2 CYP B
B.
A. 6 B. 7 C. 6 D. 7
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Example 3
Use a Calculator to Estimate a Square Root
Use a calculator.
Round to the nearest tenth.
Check for Reasonableness Since 82 64, the
answer is reasonable.?
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Example 3
A. 3.9 B. 9.8 C. 38.5 D. There is no real square
root.
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Example 4
Use a Calculator to Estimate a Negative Square
Root
Use a calculator.
Round to the nearest tenth.
Check for Reasonableness Since 72 49, the
answer is reasonable.?
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Example 4
A. 8.5 B. 36.0 C. 8.5 D. There is no real
square root.
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Example 5
Use Square Roots to Solve Problems
SKYSCRAPER The tallest building in Houston,
Texas, is the JP Morgan Chase Tower, standing at
1002 feet. About how far to the horizon can a
person standing on the top floor see? Round your
answer to the nearest tenth.
Replace h with 1002.
Evaluate the square root first.
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Example 5
Use Square Roots to Solve Problems
38.6 Multiply.
Answer On a clear day, a person could see about
38.6 miles.
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Example 5
A. 23.2 miles B. 23.3 miles C. 23.7 miles D. 24.4
miles
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End of the Lesson