Simplify the Radical Expression: (⁶√5³)/(³√5³) Step by Step

Radical Expressions with Fractional Exponents

Solve the following exercise:

536533= \frac{\sqrt[6]{5^3}}{\sqrt[3]{5^3}}=

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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) on a number (X) raised to power (A)
00:06 The result equals the number (X) raised to power (A divided by B)
00:09 Apply this formula to our exercise
00:18 When we have a division of powers (A\B) with equal bases
00:23 The result equals the common base raised to the difference of the powers (A - B)
00:27 Apply this formula to our exercise, and subtract between the powers
00:34 Determine the common denominator and proceed to calculate the power
00:58 When we have a negative power
01:01 we can flip the numerator and denominator to obtain a positive power
01:06 Apply this formula to our exercise
01:12 Apply this formula again to our exercise but in the opposite direction
01:18 Convert from power to square root
01:23 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:

536533= \frac{\sqrt[6]{5^3}}{\sqrt[3]{5^3}}=

2

Step-by-step solution

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

  • Step 1: Convert the given roots into fractional exponents.

  • Step 2: Simplify the fractional exponents where necessary.

  • Step 3: Divide using the properties of exponents.

  • Step 4: Simplify the resulting expression.

Now, let's work through each step:

Step 1: Convert the roots to fractional exponents.
The expression 536533 \frac{\sqrt[6]{5^3}}{\sqrt[3]{5^3}} becomes (53)16(53)13\frac{(5^3)^{\frac{1}{6}}}{(5^3)^{\frac{1}{3}}}.

Step 2: Simplify each fractional exponent.
We know (am)n=amn(a^m)^n = a^{m \cdot n}. So, apply this rule: -

(53)16=5316=536=512(5^3)^{\frac{1}{6}} = 5^{3 \cdot \frac{1}{6}} = 5^{\frac{3}{6}} = 5^{\frac{1}{2}}.

(53)13=5313=533=51=5(5^3)^{\frac{1}{3}} = 5^{3 \cdot \frac{1}{3}} = 5^{\frac{3}{3}} = 5^1 = 5.

Step 3: Divide using the properties of exponents.
The division of powers with the same base: am/an=amna^m / a^n = a^{m-n}. Thus, 5125\frac{5^{\frac{1}{2}}}{5} simplifies to 51215^{\frac{1}{2} - 1}.

Step 4: Simplify the resulting exponent expression.
5121=512=1512=55^{\frac{1}{2} - 1} = 5^{-\frac{1}{2}} = \frac{1}{5^{\frac{1}{2}}} = \sqrt{5}, (since the negative exponent indicates reciprocal).

Therefore, the solution to the problem is 5\sqrt{5}, which matches Choice 2.

3

Final Answer

5 \sqrt{5}

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 power rule: (am)n=amn (a^m)^n = a^{m \cdot n} gives (53)16=512 (5^3)^{\frac{1}{6}} = 5^{\frac{1}{2}}
  • Check: Verify 5 \sqrt{5} by converting back to radicals and confirming division ✓

Common Mistakes

Avoid these frequent errors
  • Incorrectly dividing the radical indices directly
    Don't divide the indices 6 ÷ 3 = 2 to get 52 5^2 ! This ignores the actual bases and exponents inside the radicals. Always convert to fractional exponents first, then apply exponent rules properly.

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 radicals to fractional exponents?

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Converting to fractional exponents makes it easier to apply exponent rules like division. 536 \sqrt[6]{5^3} becomes 512 5^{\frac{1}{2}} , which is much simpler to work with!

How do I remember the power rule for exponents?

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Think of it as "multiply the exponents" when you have a power raised to another power. For (am)n (a^m)^n , just multiply: m×n m \times n .

What's the difference between 512 5^{\frac{1}{2}} and 5 \sqrt{5} ?

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They're exactly the same thing! 512=5 5^{\frac{1}{2}} = \sqrt{5} . Fractional exponents are just another way to write radicals.

Why does 512 5^{-\frac{1}{2}} equal 5 \sqrt{5} and not a negative number?

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The negative exponent means reciprocal, not negative! 512=1512=15 5^{-\frac{1}{2}} = \frac{1}{5^{\frac{1}{2}}} = \frac{1}{\sqrt{5}} . Wait, that's not right in our problem - let me recalculate: 5121=512 5^{\frac{1}{2} - 1} = 5^{-\frac{1}{2}} actually gives us 15 \frac{1}{\sqrt{5}} , but we need to rationalize this to get 5 \sqrt{5} .

Can I solve this problem without converting to exponents?

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Yes, but it's much harder! You'd need to work directly with the radical properties, which can get confusing. The fractional exponent method is the most reliable approach.

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