Solve: Adding Square Roots of Fractions 49/4 and 9/36

Square Roots with Fractional Radicands

Solve the following exercise:

494+936= \sqrt{\frac{49}{4}}+\sqrt{\frac{9}{36}}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve the following problem
00:04 The root of a fraction (A divided by B)
00:08 Equals the root of the numerator(A) divided by the root of the denominator(B)
00:11 Apply this formula to our exercise
00:23 Factorize 49 to 7 squared
00:27 Factorize 4 to 2 squared
00:30 Factorize 9 to 3 squared
00:33 Factorize 36 to 6 squared
00:37 The root of any number (A) squared cancels out the square
00:44 Apply this formula to our exercise and proceed to cancel out the squares
01:02 Factorize 6 into factors 3 and 2
01:06 Simplify wherever possible
01:11 Combine with the common denominator
01:18 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:

494+936= \sqrt{\frac{49}{4}}+\sqrt{\frac{9}{36}}=

2

Step-by-step solution

To solve this problem, we'll proceed with the following steps:

  • Step 1: Simplify 494\sqrt{\frac{49}{4}}.
  • Step 2: Simplify 936\sqrt{\frac{9}{36}}.
  • Step 3: Add the results obtained from Step 1 and Step 2.

Step 1: We use the square root of a quotient property ab=ab\sqrt{\frac{a}{b}} = \frac{\sqrt{a}}{\sqrt{b}}. For 494\sqrt{\frac{49}{4}}:

494=494=72\sqrt{\frac{49}{4}} = \frac{\sqrt{49}}{\sqrt{4}} = \frac{7}{2}

Step 2: Similarly, apply the same property to 936\sqrt{\frac{9}{36}}:

936=936=36=12\sqrt{\frac{9}{36}} = \frac{\sqrt{9}}{\sqrt{36}} = \frac{3}{6} = \frac{1}{2}

Step 3: Add the two results obtained:

72+12=7+12=82=4\frac{7}{2} + \frac{1}{2} = \frac{7 + 1}{2} = \frac{8}{2} = 4

Therefore, the solution to the problem is 44.

3

Final Answer

4

Key Points to Remember

Essential concepts to master this topic
  • Rule: Use ab=ab \sqrt{\frac{a}{b}} = \frac{\sqrt{a}}{\sqrt{b}} to separate numerator and denominator
  • Technique: Simplify each square root separately: 49=7 \sqrt{49} = 7 , 36=6 \sqrt{36} = 6
  • Check: Verify by substituting back: 72+12=82=4 \frac{7}{2} + \frac{1}{2} = \frac{8}{2} = 4

Common Mistakes

Avoid these frequent errors
  • Adding square roots before simplifying fractions
    Don't try to add 494+936 \sqrt{\frac{49}{4}} + \sqrt{\frac{9}{36}} directly = impossible calculation! This leaves you stuck with complex radicals. Always simplify each square root of a fraction first using ab=ab \sqrt{\frac{a}{b}} = \frac{\sqrt{a}}{\sqrt{b}} .

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 can I separate the square root of a fraction?

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The quotient property of square roots says ab=ab \sqrt{\frac{a}{b}} = \frac{\sqrt{a}}{\sqrt{b}} . This works because (ab)2=ab \left(\frac{\sqrt{a}}{\sqrt{b}}\right)^2 = \frac{a}{b} , proving they're equal!

What if the fraction under the square root doesn't simplify nicely?

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Always reduce the fraction first if possible! For example, 936=14 \frac{9}{36} = \frac{1}{4} , so 936=14=12 \sqrt{\frac{9}{36}} = \sqrt{\frac{1}{4}} = \frac{1}{2} . This makes calculations much easier.

How do I add fractions with the same denominator?

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When denominators are the same, just add the numerators! So 72+12=7+12=82=4 \frac{7}{2} + \frac{1}{2} = \frac{7+1}{2} = \frac{8}{2} = 4 .

Can I use a calculator for square roots?

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Yes, but perfect squares like 4, 9, 16, 25, 36, 49 should be memorized! Knowing 49=7 \sqrt{49} = 7 and 36=6 \sqrt{36} = 6 makes this problem much faster.

What if I get a decimal answer?

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In this case, both square roots give you whole numbers (7 and 6), leading to simple fractions. Always check if your final answer can be simplified to a whole number!

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