Simplify Square Root of 686

Here we will show you two methods that you can use to simplify the square root of 686. In other words, we will show you how to find the square root of 686 in its simplest radical form using two different methods.

To be more specific, we have created an illustration below showing what we want to calculate. Our goal is to make "A" outside the radical (√) as large as possible, and "B" inside the radical (√) as small as possible.

√686 = A√B

Greatest Perfect Square Factor Method
The Greatest Perfect Square Factor Method uses the greatest perfect square factor of 686 to simplify the square root of 686. This is how to calculate A and B using this method:

A = Calculate the square root of the greatest perfect square from the list of all factors of 686. The factors of 686 are 1, 2, 7, 14, 49, 98, 343, and 686. Furthermore, the greatest perfect square on this list is 49 and the square root of 49 is 7. Therefore, A equals 7.

B = Calculate 686 divided by the greatest perfect square from the list of all factors of 686. We determined above that the greatest perfect square from the list of all factors of 686 is 49. Furthermore, 686 divided by 49 is 14, therefore B equals 14.

Now we have A and B and can get our answer to 686 in its simplest radical form as follows:

√686 = A√B

√686 = 7√14

Double Prime Factor Method
The Double Prime Factor Method uses the prime factors of 686 to simplify the square root of 686 to its simplest form possible. This is how to calculate A and B using this method:

A = Multiply all the double prime factors (pairs) of 686 and then take the square root of that product. The prime factors that multiply together to make 686 are 2 x 7 x 7 x 7. When we strip out the pairs only, we get 7 x 7 = 49 and the square root of 49 is 7. Therefore, A equals 7.

B = Divide 686 by the number (A) squared. 7 squared is 49 and 686 divided by 49 is 14. Therefore, B equals 14.

Once again we have A and B and can get our answer to 686 in its simplest radical form as follows:

√686 = A√B

√686 = 7√14

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Simplify Square Root of 687
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