Solve: Multiplication of Sixth Root and Cube Root of 12

Exponent Laws with Radical Expressions

Solve the following exercise:

126123= \sqrt[6]{12}\cdot\sqrt[3]{12}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Simplify the following equation
00:03 The C root of number A to the power of B
00:08 The result will be equal to the number to the power of B divided by C
00:13 Every number is essentially to the power of 1
00:17 We will use this formula in our exercise
00:24 When multiplying powers with equal bases
00:27 The power of the result equals the sum of the powers
00:30 We will use this formula in our exercise and add the powers
00:33 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:

126123= \sqrt[6]{12}\cdot\sqrt[3]{12}=

2

Step-by-step solution

In order to simplify the given expression we use two laws of exponents:

A. Defining the root as an exponent:

an=a1n \sqrt[n]{a}=a^{\frac{1}{n}}

B. The law of exponents for multiplication of terms with identical bases:

aman=am+n a^m\cdot a^n=a^{m+n}

Let's start from converting the roots to exponents using the law of exponents shown in A:

126123=12161213= \sqrt[\textcolor{red}{6}]{12}\cdot\sqrt[\textcolor{blue}{3}]{12}= \\ \downarrow\\ 12^{\frac{1}{\textcolor{red}{6}}}\cdot12^{\frac{1}{\textcolor{blue}{3}}}=

We continue, since a multiplication of two terms with identical bases is performed - we use the law of exponents shown in B:

12161213=1216+13 12^{\frac{1}{6}}\cdot12^{\frac{1}{3}}= \\ \boxed{12^{\frac{1}{6}+\frac{1}{3}}}

Therefore, the correct answer is answer C.

3

Final Answer

1216+13 12^{\frac{1}{6}+\frac{1}{3}}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Convert radicals to fractional exponents using an=a1n \sqrt[n]{a} = a^{\frac{1}{n}}
  • Technique: Apply aman=am+n a^m \cdot a^n = a^{m+n} when bases are identical: 12161213 12^{\frac{1}{6}} \cdot 12^{\frac{1}{3}}
  • Check: Add exponents: 16+13=16+26=36=12 \frac{1}{6} + \frac{1}{3} = \frac{1}{6} + \frac{2}{6} = \frac{3}{6} = \frac{1}{2}

Common Mistakes

Avoid these frequent errors
  • Multiplying exponents instead of adding them
    Don't multiply the exponents: 16×13=118 \frac{1}{6} \times \frac{1}{3} = \frac{1}{18} = wrong answer! This gives 12118 12^{\frac{1}{18}} instead of the correct result. Always add exponents when multiplying terms with identical bases.

Practice Quiz

Test your knowledge with interactive questions

\( (4^2)^3+(g^3)^4= \)

FAQ

Everything you need to know about this question

Why do we convert radicals to exponents first?

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Converting radicals to fractional exponents makes it easier to apply exponent laws! 126 \sqrt[6]{12} becomes 1216 12^{\frac{1}{6}} , which clearly shows we can use the multiplication rule for same bases.

How do I add fractions like 1/6 + 1/3?

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Find a common denominator! Since 13=26 \frac{1}{3} = \frac{2}{6} , we get 16+26=36=12 \frac{1}{6} + \frac{2}{6} = \frac{3}{6} = \frac{1}{2} . Always simplify your final fraction!

What if the bases were different numbers?

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If the bases are different (like 1216813 12^{\frac{1}{6}} \cdot 8^{\frac{1}{3}} ), you cannot add the exponents! The multiplication rule aman=am+n a^m \cdot a^n = a^{m+n} only works when the bases are identical.

Why isn't the answer just 12^(1/3) or 12^(1/6)?

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Those would be the answers if we were asked for just one of the radicals! But we're multiplying them together, so we need to use the exponent addition rule to get 1216+13 12^{\frac{1}{6} + \frac{1}{3}} .

Should I simplify the final answer further?

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The question asks for the exact form, so 1216+13 12^{\frac{1}{6} + \frac{1}{3}} is the complete answer. You could simplify the exponent to 1212 12^{\frac{1}{2}} or even 12 \sqrt{12} , but the addition form shows your work clearly!

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