A student claims that V80 is in the simplest radical form. Which statement is true? The claim is incorrect because 80 has a factor of 4. O The claim is correct because 80 is not divisible by three. The claim is incorrect because 80 has a factor of 8. The claim is correct because 80 is not a perfect cube.

Algebra and Trigonometry (6th Edition)
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ChapterP: Prerequisites: Fundamental Concepts Of Algebra
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Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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### Simplifying Radical Expressions

A student claims that \( \sqrt[3]{80} \) is in the simplest radical form. Which statement is true?

- ⃝ The claim is incorrect because 80 has a factor of 4.
- ⃝ The claim is correct because 80 is not divisible by three.
- ⃝ The claim is incorrect because 80 has a factor of 8.
- ⃝ The claim is correct because 80 is not a perfect cube.

In evaluating the given radical expression \( \sqrt[3]{80} \), consider the factors of 80 to determine if it is already in its simplest form or can be simplified further. 

### Understanding Cube Roots

A cube root is simplified when the radicand (the number under the radical sign) has no perfect cube factors other than 1.

#### Step-by-Step Analysis:

1. **Factor 80**: 
   \[
   80 = 2^4 \cdot 5
   \]
   
2. **Identify Perfect Cubes**:
   - \( 2^3 = 8 \) is a perfect cube and is a factor of 80.

3. **Simplify**: 
   - \( \sqrt[3]{80} = \sqrt[3]{2^4 \cdot 5} = \sqrt[3]{8 \cdot 10} = \sqrt[3]{8} \cdot \sqrt[3]{10} = 2 \cdot \sqrt[3]{10} \)

The simplified form of \( \sqrt[3]{80} \) is \( 2 \cdot \sqrt[3]{10} \).

### Conclusion:
The correct statement is that the claim is incorrect because 80 has a factor of 8, making the third option the true statement.
Transcribed Image Text:### Simplifying Radical Expressions A student claims that \( \sqrt[3]{80} \) is in the simplest radical form. Which statement is true? - ⃝ The claim is incorrect because 80 has a factor of 4. - ⃝ The claim is correct because 80 is not divisible by three. - ⃝ The claim is incorrect because 80 has a factor of 8. - ⃝ The claim is correct because 80 is not a perfect cube. In evaluating the given radical expression \( \sqrt[3]{80} \), consider the factors of 80 to determine if it is already in its simplest form or can be simplified further. ### Understanding Cube Roots A cube root is simplified when the radicand (the number under the radical sign) has no perfect cube factors other than 1. #### Step-by-Step Analysis: 1. **Factor 80**: \[ 80 = 2^4 \cdot 5 \] 2. **Identify Perfect Cubes**: - \( 2^3 = 8 \) is a perfect cube and is a factor of 80. 3. **Simplify**: - \( \sqrt[3]{80} = \sqrt[3]{2^4 \cdot 5} = \sqrt[3]{8 \cdot 10} = \sqrt[3]{8} \cdot \sqrt[3]{10} = 2 \cdot \sqrt[3]{10} \) The simplified form of \( \sqrt[3]{80} \) is \( 2 \cdot \sqrt[3]{10} \). ### Conclusion: The correct statement is that the claim is incorrect because 80 has a factor of 8, making the third option the true statement.
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