Solve: Product of Square Roots (√2 × √6 × √12) ÷ √16

Square Root Properties with Multiple Radicals

Solve the following exercise:

261216= \frac{\sqrt{2}\cdot\sqrt{6}\cdot\sqrt{12}}{\sqrt{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 When multiplying the square root of a number (A) by the square root of another number (B)
00:06 The result equals the square root of their product (A times B)
00:10 Apply this formula to our exercise and calculate the multiplication
00:38 The square root of the numerator (A) divided by square root of the denominator (B)
00:43 Equals the square root of the entire fraction (A divided by B)
00:46 Apply this formula to our exercise
00:54 Calculate 144 divided by 16
00:58 Break down 9 to 3 squared
01:01 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:

261216= \frac{\sqrt{2}\cdot\sqrt{6}\cdot\sqrt{12}}{\sqrt{16}}=

2

Step-by-step solution

To solve this problem, we'll use the properties of square roots:

  • Step 1: Apply the multiplication property of square roots in the numerator:
    2612=2612\sqrt{2} \cdot \sqrt{6} \cdot \sqrt{12} = \sqrt{2 \cdot 6 \cdot 12}
  • Step 2: Calculate the product under the square root:
    2612=1442 \cdot 6 \cdot 12 = 144
  • Step 3: Combine the expression:
    14416\frac{\sqrt{144}}{\sqrt{16}}
  • Step 4: Simplify the square roots:
    144=12\sqrt{144} = 12 and 16=4\sqrt{16} = 4
  • Step 5: Use the properties of the quotient of square roots:
    124=3\frac{12}{4} = 3

Thus, the final simplified expression is 3 \mathbf{3} .

3

Final Answer

3

Key Points to Remember

Essential concepts to master this topic
  • Rule: ab=ab \sqrt{a} \cdot \sqrt{b} = \sqrt{a \cdot b} for multiplication property
  • Technique: Calculate 2612=144 2 \cdot 6 \cdot 12 = 144 before taking square root
  • Check: Verify 144=12 \sqrt{144} = 12 and 124=3 \frac{12}{4} = 3

Common Mistakes

Avoid these frequent errors
  • Calculating square roots individually before multiplying
    Don't calculate √2 = 1.414... × √6 = 2.449... × √12 = 3.464... = messy decimals! This creates rounding errors and makes the problem unnecessarily complex. Always multiply the numbers under the radicals first: √2 × √6 × √12 = √(2×6×12) = √144.

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 together?

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Yes! This is exactly what the multiplication property tells us: ab=ab \sqrt{a} \cdot \sqrt{b} = \sqrt{a \cdot b} . So 2612=2612 \sqrt{2} \cdot \sqrt{6} \cdot \sqrt{12} = \sqrt{2 \cdot 6 \cdot 12} .

What if I can't remember if 144 is a perfect square?

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Try thinking of common perfect squares: 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144. Since 12×12=144 12 \times 12 = 144 , we know 144=12 \sqrt{144} = 12 !

Can I simplify each square root before multiplying?

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You could, but it's more work! 12=23 \sqrt{12} = 2\sqrt{3} creates messier calculations. It's easier to use the multiplication property and combine everything under one radical first.

Why don't I need to rationalize the denominator here?

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Since 16=4 \sqrt{16} = 4 (a whole number), there's no radical left in the denominator to rationalize. The final answer 3 is already in simplest form.

What's the difference between √(a×b) and √a × √b?

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They're the same thing! The multiplication property of radicals says a×b=a×b \sqrt{a} \times \sqrt{b} = \sqrt{a \times b} . We can work in either direction depending on what makes the problem easier.

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