Solve √30 × √1: Step-by-Step Radical Multiplication

Radical Multiplication with Identity Elements

Solve the following exercise:

301= \sqrt{30}\cdot\sqrt{1}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:07 Let's solve this problem together.
00:10 The square root of A, times the square root of B.
00:14 Is the same as the square root of A times B.
00:18 Use this to calculate the product of A and B.
00:22 And that's the solution! Great job!

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve the following exercise:

301= \sqrt{30}\cdot\sqrt{1}=

2

Step-by-step solution

Let's start with a reminder of the definition of a root as a power:

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

We will then use the fact that raising the number 1 to any power always yields the result 1, particularly raising it to the power of half of the square root (which we obtain by using the definition of a root as a power mentioned earlier).

In other words:

301=3012=30112=301=30 \sqrt{30}\cdot\sqrt{1}= \\ \downarrow\\ \sqrt{30}\cdot\sqrt[2]{1}=\\ \sqrt{30}\cdot 1^{\frac{1}{2}}=\\ \sqrt{30} \cdot1=\\ \boxed{\sqrt{30}}

Therefore, the correct answer is answer C.

3

Final Answer

30 \sqrt{30}

Key Points to Remember

Essential concepts to master this topic
  • Identity Property: Any number multiplied by 1 equals itself
  • Technique: 1=1 \sqrt{1} = 1 so 301=301 \sqrt{30} \cdot \sqrt{1} = \sqrt{30} \cdot 1
  • Check: Verify 1=1 \sqrt{1} = 1 since 12=1 1^2 = 1

Common Mistakes

Avoid these frequent errors
  • Multiplying the numbers under the radical signs
    Don't calculate 30×1=30 \sqrt{30 \times 1} = \sqrt{30} and think that's the method! While this gives the right answer here, it misses the key concept. Always recognize that 1=1 \sqrt{1} = 1 first, then use the identity 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

Why does √1 equal 1?

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Because 1 × 1 = 1! The square root asks "what number times itself gives 1?" The answer is 1, since 12=1 1^2 = 1 .

Can I just multiply 30 × 1 under the radical?

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While 30×1=30 \sqrt{30 \times 1} = \sqrt{30} works here, it's better to recognize that 1=1 \sqrt{1} = 1 first. This identity property is more useful in complex problems!

What's the identity property for multiplication?

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The identity property says that any number multiplied by 1 equals itself. So a×1=a a \times 1 = a for any number a, including radicals like 30 \sqrt{30} .

Would this work with other square roots of 1?

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Yes! Since 1=1 \sqrt{1} = 1 always, any expression like 51 \sqrt{5} \cdot \sqrt{1} or 1001 \sqrt{100} \cdot \sqrt{1} just equals the first radical.

How do I check my answer?

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Verify that 301=301=30 \sqrt{30} \cdot \sqrt{1} = \sqrt{30} \cdot 1 = \sqrt{30} . You can also check that (30)2=30 (\sqrt{30})^2 = 30 to confirm your radical is correct.

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