Value Comparison Exercise: Identifying the Maximum Number

Radical Comparisons with Different Root Indices

Choose the largest value:

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Choose the largest value
00:03 A 6th root is like a power with the reciprocal of 6 (one-sixth)
00:07 Apply the same method to all expressions and determine the largest value
00:23 A "regular" root raised to the second power
00:28 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Choose the largest value:

2

Step-by-step solution

We need to find the largest of the given roots of 64:

  • Calculate 646\sqrt[6]{64}:
    646=641/6 \sqrt[6]{64} = 64^{1/6}
    Since 64=2664 = 2^6, we have:
    (26)1/6=2 (2^6)^{1/6} = 2

  • Calculate 644\sqrt[4]{64}:
    644=641/4 \sqrt[4]{64} = 64^{1/4}
    Using the exponent 64=2664 = 2^6, we get:
    (26)1/4=26/4=21.5=82=2×22.828 (2^6)^{1/4} = 2^{6/4} = 2^{1.5} = \sqrt[2]{8} = 2 \times \sqrt{2} \approx 2.828

  • Calculate 643\sqrt[3]{64}:
    643=641/3 \sqrt[3]{64} = 64^{1/3}
    This simplifies to:
    (26)1/3=26/3=22=4 (2^6)^{1/3} = 2^{6/3} = 2^2 = 4

  • Calculate 64\sqrt[]{64}:
    64=641/2 \sqrt[]{64} = 64^{1/2}
    This gives us:
    (26)1/2=26/2=23=8 (2^6)^{1/2} = 2^{6/2} = 2^3 = 8

Now, let's compare these calculated values:
- 646=2\sqrt[6]{64} = 2
- 6442.828\sqrt[4]{64} \approx 2.828
- 643=4\sqrt[3]{64} = 4
- 64=8\sqrt[]{64} = 8

Among these values, the largest value is 64\sqrt[]{64}, which equals 8.

Therefore, the largest value is 64 \sqrt[]{64} .

3

Final Answer

64 \sqrt[]{64}

Key Points to Remember

Essential concepts to master this topic
  • Pattern: Smaller root indices give larger values for numbers > 1
  • Technique: Convert to exponential form: 64n=641/n \sqrt[n]{64} = 64^{1/n}
  • Check: Calculate each value: 2, 2.828, 4, 8 - largest is 8 ✓

Common Mistakes

Avoid these frequent errors
  • Thinking higher root indices give bigger results
    Don't assume 646>64 \sqrt[6]{64} > \sqrt[]{64} because 6 > 2! Higher root indices actually give smaller values for numbers greater than 1. Always calculate each root value first, then compare the results.

Practice Quiz

Test your knowledge with interactive questions

Solve the following exercise:

\( \sqrt[10]{\sqrt[10]{1}}= \)

FAQ

Everything you need to know about this question

Why does the square root give the largest value?

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For numbers greater than 1, smaller root indices produce larger results. Since 64 \sqrt[]{64} has index 2 (the smallest), it gives the largest value: 8!

How do I calculate these roots without a calculator?

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Use the fact that 64 = 2⁶! Then 64n=(26)1/n=26/n \sqrt[n]{64} = (2^6)^{1/n} = 2^{6/n} . For example: 643=26/3=22=4 \sqrt[3]{64} = 2^{6/3} = 2^2 = 4

What if I need to compare roots of different numbers?

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Calculate each root separately first, then compare the decimal values. Don't try to compare the radical expressions directly - convert them to numbers!

Is there a pattern for comparing different roots?

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Yes! For any number greater than 1:

  • Smaller root indices → larger values
  • Larger root indices → smaller values

For numbers between 0 and 1, this pattern reverses!

Why do we write √64 instead of √²64?

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The square root symbol automatically means index 2. Writing 642 \sqrt[2]{64} is redundant - mathematicians prefer the simpler 64 \sqrt{64} notation.

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