75 radical and exponential expressions · lesson objectives teacher's notes lesson notes 75...

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1 Lesson Objectives Teacher's Notes Lesson Notes 75 Radical and Exponential Expressions Square Roots A square root is equivalent to an exponent of onehalf. exponent ___________________________ index 2 1 Why? _________________________________ Erase the blue oval to check your explanation.

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Page 1: 75 Radical and Exponential Expressions · Lesson Objectives Teacher's Notes Lesson Notes 75 Radical and Exponential Expressions Square Roots A square root is equivalent to an exponent

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Lesson Objectives Teacher's Notes Lesson Notes             

7­5 Radical and Exponential Expressions

Square Roots

A square root is equivalent to an exponent of one­half.

exponent___________________________

index2 1

Why?  _________________________________

Erase the blue oval to check your explanation. 

Page 2: 75 Radical and Exponential Expressions · Lesson Objectives Teacher's Notes Lesson Notes 75 Radical and Exponential Expressions Square Roots A square root is equivalent to an exponent

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Cube roots

What exponent is equivalent to a cube root?

311 exponent

___________________________

index

Converting Practice

Write using rational exponents. 

Press tiles to reveal solutions. 

Page 3: 75 Radical and Exponential Expressions · Lesson Objectives Teacher's Notes Lesson Notes 75 Radical and Exponential Expressions Square Roots A square root is equivalent to an exponent

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nth RootsWhat exponent is equivalent to an nth root?

Use the magnifying glass to reveal the answer.

mn__

Pull for Teacher's Notes

Some students may benefit from a summary of the general rule: 

•  The index becomesthe denominator.

 •  The exponent becomes 

the numerator. 

Reducing Practice

Write using rational exponents. Then reduce.

Press tiles to reveal solutions. 

Page 4: 75 Radical and Exponential Expressions · Lesson Objectives Teacher's Notes Lesson Notes 75 Radical and Exponential Expressions Square Roots A square root is equivalent to an exponent

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Number Cube Practice

Use number cubes to generate values of m and n.       Write as a rational exponent. Reduce if necessary.

n:

m:

Pull for Teacher's Notes

Help students realize that m becomes the numerator of the rational exponent.

Likewise, n becomes the denominator of the rational exponent.

Have students reduce the rational exponent they get.

Convert and simplify numerically and check with your calculator.

Page 5: 75 Radical and Exponential Expressions · Lesson Objectives Teacher's Notes Lesson Notes 75 Radical and Exponential Expressions Square Roots A square root is equivalent to an exponent

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Match Equivalents

Pull for Teacher's Notes

Some expressions are complicated and challenging.

Have students look for expressions that are obviously equivalent.

Click on the snap button when the expressions shown on the cards are equivalent.

ChallengeWrite these rational exponents using radicals. Then click each tile to check your answers.

Page 6: 75 Radical and Exponential Expressions · Lesson Objectives Teacher's Notes Lesson Notes 75 Radical and Exponential Expressions Square Roots A square root is equivalent to an exponent

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Fire up those clickers ...

1 What is the index of a square root?A  

B  

C  

D 2

Page 7: 75 Radical and Exponential Expressions · Lesson Objectives Teacher's Notes Lesson Notes 75 Radical and Exponential Expressions Square Roots A square root is equivalent to an exponent

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2 Which exponent is equivalent to a square root?

A  

B  

C  

D  

3 Which exponent is equivalent to a cube root?

A  

B  

C  

D  

Page 8: 75 Radical and Exponential Expressions · Lesson Objectives Teacher's Notes Lesson Notes 75 Radical and Exponential Expressions Square Roots A square root is equivalent to an exponent

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4 What is        written using rational exponents?

A  

D  

B  

C  

5 What is        written using rational exponents?

A  

D  

B  

C  

Page 9: 75 Radical and Exponential Expressions · Lesson Objectives Teacher's Notes Lesson Notes 75 Radical and Exponential Expressions Square Roots A square root is equivalent to an exponent

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6 What is        written using rational exponents?

A  

D  

B  

C  

7 What is        written using rational exponents?

A  

D  

B  

C  

Page 10: 75 Radical and Exponential Expressions · Lesson Objectives Teacher's Notes Lesson Notes 75 Radical and Exponential Expressions Square Roots A square root is equivalent to an exponent

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8 How do you reduce a rational exponent? 

A Cancel common factors in the numerator and denominator.

B Subtract common factors in the numerator and denominator.

C Take the square root of common factors in the numerator and denominator. 

D Subtract the square root of common factors in the numerator and denominator.  

9  

A  

D  

B  

C