The root sign is a mathematical symbol, and the root sign is a symbol used to represent the root operation of a number or an algebraic expression. In the range of real numbers, even root sign cannot be negative, and its operation result is not negative. It can be negative under the odd root sign.
A number in the radical sign (called A for the time being) refers to the positive square root of this number (called B). That is, the square of b is a. After the concept is clear, let's start with a simple natural number. The radical sign of a natural number. For example, 4, 1, 16, 9 and so on, it can be directly concluded that b is also a natural number, corresponding to 2, 1, 4, 3.
If the factor of this number A has a complete square number C, then given C, the rest remains in the root number, such as the root number 18, 18 = 9 * 2, and 9 is a complete square number, then the root number 18 = 3 root number 2.
If this number does not have a complete square factor, it all stays in the root sign. If the root number is 33, still write the root number 33. Remember, if the questioner asks what the square root of 9 is, he must answer plus or minus 3.
sign
The root sign is a mathematical symbol. The root sign is a symbol used to represent the root operation of a number or an algebra. If a? = b, then A is the n-th root of B or A is the 1/n power of B, and the n-th handwritten and printed characters are represented by n √ [3]. The number of roots or algebraic expressions are written in the area surrounded by the left √ and right of the symbol and the lower part of a horizontal part above the symbol, which cannot be crossed.
The origin of root symbol
In modern times, we use the root sign (such as √). ) and find it simple and convenient. In ancient times, Egyptians used the symbol ┌ to represent the square root. Indians write ka in front of the square root number. Used by Arabs. At the beginning of the16th century, perhaps because of the fast writing speed, the dot had a slender tail and became "√ ~". 1525, Rudolf adopted the radical sign for the first time in his algebra works. For example, he wrote that 4 is 2 and 9 is 3, but this writing method has not been generally recognized and adopted.