Solve Nested Radicals: Sixth Root of √64 × Fourth Root of ∛16

Nested Radicals with Exponent Conversion

Complete the following exercise:

6461634= \sqrt[6]{\sqrt{64}}\cdot\sqrt[4]{\sqrt[3]{16}}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve the following problem
00:03 A 'regular' root raised to the second power
00:11 When there is a root of order (C) to root (B)
00:15 The result equals the root of the product of the orders
00:19 Apply this formula to our exercise
00:29 When we have a root of order (C) on number (A) to the power of (B)
00:32 If we have a product (A times B) in a root of order (C)
00:36 We can divide the product into two roots of order (C)
00:40 Apply this formula to our exercise, in reverse
00:49 Let's calculate the product
00:53 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Complete the following exercise:

6461634= \sqrt[6]{\sqrt{64}}\cdot\sqrt[4]{\sqrt[3]{16}}=

2

Step-by-step solution

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

  • Step 1: Simplify 64\sqrt{64}.
  • Step 2: Simplify with 6\sqrt[6]{}.
  • Step 3: Simplify 163\sqrt[3]{16}.
  • Step 4: Simplify with 4\sqrt[4]{}.
  • Step 5: Combine the simplified results.

Now, let's work through each step:

Step 1: Simplify 64\sqrt{64}.
Since 64=8264 = 8^2, we have 64=8\sqrt{64} = 8.

Step 2: Simplify 86\sqrt[6]{8} using exponent rules:
86=81/6\sqrt[6]{8} = 8^{1/6}.

Step 3: Simplify 163\sqrt[3]{16}.
Since 16=2416 = 2^4, then 163=(24)1/3=24/3\sqrt[3]{16} = (2^4)^{1/3} = 2^{4/3}.

Step 4: Simplify 24/34\sqrt[4]{2^{4/3}} using exponent rules:
We have 24/34=(24/3)1/4=24/12=21/3\sqrt[4]{2^{4/3}} = (2^{4/3})^{1/4} = 2^{4/12} = 2^{1/3}.

Step 5: Combine simplified results:
We have 81/621/3=(23)1/621/3=23/621/3=21/221/3=2(1/2+1/3)=2(3/6+2/6)=25/6.8^{1/6} \cdot 2^{1/3} = (2^3)^{1/6} \cdot 2^{1/3} = 2^{3/6} \cdot 2^{1/3} = 2^{1/2} \cdot 2^{1/3} = 2^{(1/2 + 1/3)} = 2^{(3/6 + 2/6)} = 2^{5/6}.

Convert to a common root form:
The result is equivalent to 25/6=21012=1024122^{5/6} = \sqrt[12]{2^{10}} = \sqrt[12]{1024}.

Therefore, the solution to the problem is 102412 \sqrt[12]{1024} .

3

Final Answer

102412 \sqrt[12]{1024}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert nested radicals to fractional exponents before simplifying
  • Technique: 646=86=81/6=(23)1/6=21/2 \sqrt[6]{\sqrt{64}} = \sqrt[6]{8} = 8^{1/6} = (2^3)^{1/6} = 2^{1/2}
  • Check: Convert final answer back to verify: 25/6=21012=102412 2^{5/6} = \sqrt[12]{2^{10}} = \sqrt[12]{1024}

Common Mistakes

Avoid these frequent errors
  • Calculating inner radicals incorrectly
    Don't calculate 64=6 \sqrt{64} = 6 or 163=4 \sqrt[3]{16} = 4 = wrong foundation! These basic errors compound through the entire problem, leading to completely wrong final answers. Always double-check: 64=8 \sqrt{64} = 8 and 163=24/3 \sqrt[3]{16} = 2^{4/3} .

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 we convert radicals to fractional exponents?

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Fractional exponents make multiplication easier! When you have a1/6b1/3 a^{1/6} \cdot b^{1/3} , you can combine them using exponent rules. With radical notation, it's much harder to see how to combine a6b34 \sqrt[6]{a} \cdot \sqrt[4]{\sqrt[3]{b}} .

How do I handle nested radicals like √[4]{∛16}?

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Work from the inside out! First calculate 163=161/3=(24)1/3=24/3 \sqrt[3]{16} = 16^{1/3} = (2^4)^{1/3} = 2^{4/3} , then apply the fourth root: 24/34=(24/3)1/4=21/3 \sqrt[4]{2^{4/3}} = (2^{4/3})^{1/4} = 2^{1/3} .

Why does 2^(5/6) equal ∜[12]{1024}?

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To convert 25/6 2^{5/6} to a 12th root, multiply both numerator and denominator by 2: 25/6=210/12=21012 2^{5/6} = 2^{10/12} = \sqrt[12]{2^{10}} . Since 210=1024 2^{10} = 1024 , we get 102412 \sqrt[12]{1024} .

What if I get a different common denominator for the exponents?

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Any common denominator works! Whether you use 6, 12, or another number, you'll get the same answer. Choose the least common multiple of your denominators to keep numbers smaller and easier to work with.

Can I simplify the final radical further?

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Check if the number under the radical has any perfect powers! Since 1024=210 1024 = 2^{10} and we need the 12th root, we can't simplify further because 10 and 12 share only factor 2, not enough to pull anything out completely.

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