Q: You write a radical sign to indicate a square root The number under this sign is called the radical?

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No, there is no such requirement or convention.

The symbol used to indicate a nonnegative square root.

The number of which the square root is to be found is called the "radicand." The symbol before the number is called the radical sign. ( √ ) E.g. √4 = 2, √25 = 5

A square root

If the product of two irrationals is a rational, then they are both the same radical of a non-perfect square. For example, radical 5 times radical 5 is 5, since that is by definiton what a radical is.

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It is the RADICAL SIGN , its definition is - the symbol used to indicate a nonnegitive square root.

No, there is no such requirement or convention.

The radical symbol, otherwise known as the "square root sign", lets you take the nth root of any number.Any number can be placed above, and slightly to the left, of the square root sign, to indicate the nth root. For example, the cube root of 27 is 3.The number inside the square root sign (that which you are finding the square root of), is called the radicand.

it looks like a check mark. it is called the radical. it looks like this --> √

The symbol used to indicate a nonnegative square root.

The number of which the square root is to be found is called the "radicand." The symbol before the number is called the radical sign. ( √ ) E.g. √4 = 2, √25 = 5

Radical Sign

The square root (radical) of 5 is about 2.2361 (an irrational number)

If the number inside the radical is a perfect square or a ratio of perfect squares.

you have to square the outside number and then multiply it by the number inside the squareroot sign.

4 radical 2

it the number that is simfilied