- A radical is a symbol placed over a number or an expression, called the radicand, to indicate the root of the radicand. When used without a sign or an index number, it designates the positive square root of the radicand i.e. 2. If both squares are meant, the radical is preceded ±. To indicate higher roots of the radicand. The radical sign is usually taken to indicate the principal root of the radicand, although any radicand with have (n) different nth roots. Radical is used to refer to the entire expression using radical signs and a radicand.
-examples: the square root of 16 is 4 because 4x4= 16
another example would be the square root of 56 is 8 or 7 because 7x8= 56
-A radical can be used in math and chemistry.
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I agree with Tianna about radicals being used in math and chemistry. I Like that she also put in the meaning of radicand and tied it in with the her definition of radical. Another thing I like is that she had great examples and they were easy to understand because you are going to get nowhere without being taught how a radical works. Good job on explaining what a radical is.
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