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These instuctions are for a Texas Instruments graphing calculator. First type 5. Then press the math key and select the fifth option. Then type the number you want under the radical.
√200 = 10√2. In order to simplify square roots, you find what factors of the number under the radical sign you can take the square root of. In the case of 200, its factors are 5 * 2 * 2 * 5 * 2. You can take the square root of 2 * 2 and 5 * 5, which are 2 and 5, respectively. 2 and 5 are on the outside of the radical sign, so you multiply them together to equal 10, while the remaining 2 stays under the radical.
The radicand is the value under the radical symbol.
radicand
the radical sign