Solve: Cube Root of 6² Divided by Fourth Root of 6²

Radical Expressions with Fractional Exponents

Solve the following exercise:

623624= \frac{\sqrt[3]{6^2}}{\sqrt[4]{6^2}}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Simplify the following problem
00:03 When we have a root of the order (B) over number (X) raised to power (A)
00:07 The result equals the number (X) raised to the power (A divided by B)
00:10 Apply this formula to our exercise
00:17 When we have division of powers (A\B) with equal bases
00:22 The result equals the common base raised to power of the difference of exponents (A - B)
00:29 Apply this formula to our exercise, and proceed to subtract between the powers
00:36 Determine the common denominator and calculate the power
00:53 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve the following exercise:

623624= \frac{\sqrt[3]{6^2}}{\sqrt[4]{6^2}}=

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Convert the roots to fractional exponents.
  • Step 2: Simplify the fractional exponents using properties of exponents.
  • Step 3: Determine the simplified expression and verify the answer choice.

Now, let's work through each step:

Step 1: Convert the roots to fractional exponents.
The cube root 623 \sqrt[3]{6^2} can be expressed as (62)1/3=62/3 (6^2)^{1/3} = 6^{2/3} .

The fourth root 624 \sqrt[4]{6^2} can be written as (62)1/4=62/4=61/2 (6^2)^{1/4} = 6^{2/4} = 6^{1/2} .

Step 2: Simplify the quotient of these fractional exponents.
We have 62/361/2 \frac{6^{2/3}}{6^{1/2}} .

Using the property of exponents aman=amn \frac{a^m}{a^n} = a^{m-n} , we get:

62/31/2 6^{2/3 - 1/2} .

Step 3: Calculate 2/31/2 2/3 - 1/2 .
To subtract these fractions, find a common denominator. The common denominator of 3 and 2 is 6.

- Convert 2/3 2/3 to sixths: 2232=46 \frac{2 \cdot 2}{3 \cdot 2} = \frac{4}{6}

- Convert 1/2 1/2 to sixths: 1323=36 \frac{1 \cdot 3}{2 \cdot 3} = \frac{3}{6}

Perform the subtraction: 4636=16 \frac{4}{6} - \frac{3}{6} = \frac{1}{6} .

The expression simplifies to 61/6 6^{1/6} .

Therefore, the simplified answer is 616\mathbf{6^{\frac{1}{6}}}, which corresponds to the correct choice: 3.

The solution to the problem is 616 \mathbf{6^{\frac{1}{6}}} .

3

Final Answer

616 6^\frac{1}{6}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert radicals to fractional exponents before dividing
  • Technique: Use aman=amn \frac{a^m}{a^n} = a^{m-n} to subtract exponents
  • Check: Verify 2312=4636=16 \frac{2}{3} - \frac{1}{2} = \frac{4}{6} - \frac{3}{6} = \frac{1}{6}

Common Mistakes

Avoid these frequent errors
  • Dividing the radical indices instead of converting to exponents
    Don't divide 3 by 4 to get 63/4 6^{3/4} ! This ignores the squared terms inside the radicals and gives the wrong answer. Always convert each radical to fractional exponents first: 623=62/3 \sqrt[3]{6^2} = 6^{2/3} and 624=61/2 \sqrt[4]{6^2} = 6^{1/2} .

Practice Quiz

Test your knowledge with interactive questions

Solve the following exercise:

\( \sqrt{\frac{2}{4}}= \)

FAQ

Everything you need to know about this question

Why do I need to convert the radicals to fractional exponents?

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Converting to fractional exponents makes division much easier! You can use the simple rule aman=amn \frac{a^m}{a^n} = a^{m-n} instead of dealing with complicated radical division rules.

How do I convert a radical like 623 \sqrt[3]{6^2} ?

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Use the rule: amn=am/n \sqrt[n]{a^m} = a^{m/n} . So 623=62/3 \sqrt[3]{6^2} = 6^{2/3} because the exponent goes on top and the radical index goes on bottom.

What's the hardest part about subtracting fractions like 2312 \frac{2}{3} - \frac{1}{2} ?

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Finding the common denominator! The LCD of 3 and 2 is 6. Convert: 23=46 \frac{2}{3} = \frac{4}{6} and 12=36 \frac{1}{2} = \frac{3}{6} , then subtract to get 16 \frac{1}{6} .

Can I just multiply the radicals instead of dividing?

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No! The problem asks for division: 623624 \frac{\sqrt[3]{6^2}}{\sqrt[4]{6^2}} . This means you need to subtract exponents, not add them like you would when multiplying.

How can I check if 61/6 6^{1/6} is the right answer?

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Work backwards! Convert back to radicals: 61/6=616=66 6^{1/6} = \sqrt[6]{6^1} = \sqrt[6]{6} . You can also verify your fraction arithmetic: 4636=16 \frac{4}{6} - \frac{3}{6} = \frac{1}{6}

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