Simplify Square Root of 128




Here we will show you two methods that you can use to simplify the square root of 128. In other words, we will show you how to find the square root of 128 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.

128 = A√B




Greatest Perfect Square Factor Method
The Greatest Perfect Square Factor Method uses the greatest perfect square factor of 128 to simplify the square root of 128. 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 128. The factors of 128 are 1, 2, 4, 8, 16, 32, 64, and 128. Furthermore, the greatest perfect square on this list is 64 and the square root of 64 is 8. Therefore, A equals 8.

B = Calculate 128 divided by the greatest perfect square from the list of all factors of 128. We determined above that the greatest perfect square from the list of all factors of 128 is 64. Furthermore, 128 divided by 64 is 2, therefore B equals 2.

Now we have A and B and can get our answer to 128 in its simplest radical form as follows:

128 = A√B

128 = 8√2




Double Prime Factor Method
The Double Prime Factor Method uses the prime factors of 128 to simplify the square root of 128 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 128 and then take the square root of that product. The prime factors that multiply together to make 128 are 2 x 2 x 2 x 2 x 2 x 2 x 2. When we strip out the pairs only, we get 2 x 2 x 2 x 2 x 2 x 2 = 64 and the square root of 64 is 8. Therefore, A equals 8.

B = Divide 128 by the number (A) squared. 8 squared is 64 and 128 divided by 64 is 2. Therefore, B equals 2.

Once again we have A and B and can get our answer to 128 in its simplest radical form as follows:

128 = A√B

128 = 8√2



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Simplify Square Root of 129
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