Solve: Square Root of 4/2 Plus Square Root of 6/3

Square Root Operations with Fraction Simplification

Solve the following exercise:

42+63= \sqrt{\frac{4}{2}}+\sqrt{\frac{6}{3}}=

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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 Calculate each fraction
00:12 Every root is essentially itself multiplied by 1
00:24 It seems they have a common denominator, let's proceed to collect terms
00:27 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:

42+63= \sqrt{\frac{4}{2}}+\sqrt{\frac{6}{3}}=

2

Step-by-step solution

To solve this problem, we'll eliminate fractions under the square roots by simplifying directly:

  • Step 1: Simplify each fraction inside the square roots:
    42=2 \frac{4}{2} = 2 and 63=2 \frac{6}{3} = 2 .
  • Step 2: Apply the square root to each simplified fraction:
    42=2\sqrt{\frac{4}{2}} = \sqrt{2} and 63=2\sqrt{\frac{6}{3}} = \sqrt{2}.
  • Step 3: Add the results of the square roots:
    2+2=22\sqrt{2} + \sqrt{2} = 2\sqrt{2}.

Therefore, the solution to the problem is 222\sqrt{2}.

3

Final Answer

22 2\sqrt{2}

Key Points to Remember

Essential concepts to master this topic
  • Rule: Simplify fractions inside square roots before taking the square root
  • Technique: 42=2 \frac{4}{2} = 2 and 63=2 \frac{6}{3} = 2 , so both become 2 \sqrt{2}
  • Check: 2+2=22 \sqrt{2} + \sqrt{2} = 2\sqrt{2} , verify: (22)2=8 (2\sqrt{2})^2 = 8

Common Mistakes

Avoid these frequent errors
  • Adding square roots without simplifying fractions first
    Don't try to compute 42+63 \sqrt{\frac{4}{2}} + \sqrt{\frac{6}{3}} directly = messy calculations and wrong answers! This makes the problem unnecessarily complex and leads to errors. Always simplify the fractions inside the square roots first: 42=2 \frac{4}{2} = 2 and 63=2 \frac{6}{3} = 2 , then take square roots.

Practice Quiz

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Choose the largest value

FAQ

Everything you need to know about this question

Why do I need to simplify the fractions first?

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Simplifying fractions inside square roots makes the problem much easier! Instead of working with 42 \sqrt{\frac{4}{2}} , you get 2 \sqrt{2} , which is cleaner to work with.

Can I add square roots like regular numbers?

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Only if they have the same radicand! Since both 2+2 \sqrt{2} + \sqrt{2} have the same number under the square root, you can combine them: 2+2=22 \sqrt{2} + \sqrt{2} = 2\sqrt{2} .

What if the fractions don't simplify to the same number?

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Then you'll get different square roots that cannot be combined. For example, 3+5 \sqrt{3} + \sqrt{5} stays as is because 3 and 5 are different.

How do I know if my final answer is in simplest form?

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Your answer 22 2\sqrt{2} is simplified because:

  • The number under the square root (2) has no perfect square factors
  • The coefficient (2) is already simplified

Can I use a calculator to check my work?

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Yes! Calculate 222.828 2\sqrt{2} \approx 2.828 , and separately calculate 2+21.414+1.414=2.828 \sqrt{2} + \sqrt{2} \approx 1.414 + 1.414 = 2.828 . They should match!

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