Multiply Square Roots: Solving √(2/4) × √6 Step by Step

Square Root Multiplication with Fractional Radicands

Solve the following exercise:

246= \sqrt{\frac{2}{4}}\cdot\sqrt{6}=

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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 When multiplying the square root of a number (A) by the square root of another number (B)
00:07 The result equals the square root of their product (A times B)
00:11 Apply this formula to our exercise and proceed to calculate the product
00:20 Make sure to multiply numerator by numerator and denominator by denominator
00:25 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:

246= \sqrt{\frac{2}{4}}\cdot\sqrt{6}=

2

Step-by-step solution

To solve the expression 246\sqrt{\frac{2}{4}} \cdot \sqrt{6}, we will break it down and simplify step by step.

Step 1: Simplify the square root of the fraction.
24\sqrt{\frac{2}{4}} can be rewritten using the square root of a quotient property:
24=24\sqrt{\frac{2}{4}} = \frac{\sqrt{2}}{\sqrt{4}}.

Step 2: Simplify 4\sqrt{4}.
Since 4=2\sqrt{4} = 2, the expression becomes:
22\frac{\sqrt{2}}{2}.

Step 3: Multiply by 6\sqrt{6}.
Now multiply 22\frac{\sqrt{2}}{2} by 6\sqrt{6}:
226=262\frac{\sqrt{2}}{2} \cdot \sqrt{6} = \frac{\sqrt{2 \cdot 6}}{2}.

Step 4: Simplify the square root.
The multiplication inside the square root becomes 12\sqrt{12}, so:
122\frac{\sqrt{12}}{2}.

Step 5: Simplify 12\sqrt{12}.
Since 12=43=43=23\sqrt{12} = \sqrt{4 \cdot 3} = \sqrt{4} \cdot \sqrt{3} = 2\sqrt{3},
this results in 232=3\frac{2\sqrt{3}}{2} = \sqrt{3}.

Therefore, the solution to the problem is 3\sqrt{3}.

3

Final Answer

3 \sqrt{3}

Key Points to Remember

Essential concepts to master this topic
  • Property: Use ab=ab \sqrt{a} \cdot \sqrt{b} = \sqrt{a \cdot b} to combine radicals
  • Technique: Simplify 24=22 \sqrt{\frac{2}{4}} = \frac{\sqrt{2}}{2} before multiplying by 6 \sqrt{6}
  • Check: Verify 3×3=3 \sqrt{3} \times \sqrt{3} = 3 matches our simplified result ✓

Common Mistakes

Avoid these frequent errors
  • Multiplying the numbers under the radicals without simplifying fractions first
    Don't multiply 246=124=3 \sqrt{\frac{2}{4}} \cdot \sqrt{6} = \sqrt{\frac{12}{4}} = \sqrt{3} directly without recognizing that 24=12 \frac{2}{4} = \frac{1}{2} ! While this works, it's harder and you might make arithmetic errors. Always simplify fractions under radicals first, then apply the multiplication property.

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

Can I multiply the numbers under the square roots directly?

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Yes, you can! Use the property ab=ab \sqrt{a} \cdot \sqrt{b} = \sqrt{a \cdot b} . So 246=246=124=3 \sqrt{\frac{2}{4}} \cdot \sqrt{6} = \sqrt{\frac{2}{4} \cdot 6} = \sqrt{\frac{12}{4}} = \sqrt{3} .

Why do I need to simplify the fraction first?

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Simplifying 24=12 \frac{2}{4} = \frac{1}{2} first makes the calculation much easier! It helps you spot perfect squares and reduces the chance of arithmetic mistakes in larger numbers.

How do I know when to use the quotient property for square roots?

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Use ab=ab \sqrt{\frac{a}{b}} = \frac{\sqrt{a}}{\sqrt{b}} when you have a fraction under the radical. This lets you simplify the denominator separately, which is often easier!

What if I get a decimal answer instead of a radical?

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For exact answers, leave results in radical form like 3 \sqrt{3} . Only convert to decimals when specifically asked, since radicals show the precise mathematical relationship.

How can I check if my answer is correct?

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Square your final answer! Since we got 3 \sqrt{3} , check: (3)2=3 (\sqrt{3})^2 = 3 . Also verify by working backwards through your steps.

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