How is the square root of 81 plus the square root of 144 solved?


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Square Root Just as with "regular" numbers, square roots can be added together. But you might not be able to simplify the addition all the way down to one number. Just as "you can't add apples and oranges", so also you cannot combine "unlike" radicals. To add radical terms together, they have to have the same radical part. The answer to your question is 21.

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