Radical indicates the root of a number. It is usuallyused to indicate square root. For example, 4 = 2, since 2 x 2 = 4. A square root of any number is another number, which, when multiplied by itself, equals that number. Here is another example: 16 = ? The answer is 4, since 4 x 4 = 16.
When the radical is used with a small number in the upper left, it stands for a smaller root. For example 327 = 3, since 3 x 3 x 3 = 27. In the same way 4256 stands for the fourth root of 256 , or a number multiplied by itself four times to equal 256. The answer is 4, since 4 x 4 x 4 x 4 = 256.
A small number written at the upper right hand corner of another number is called an exponent. It is mathematical shorthand to indicate the number of times you have to multiply the number by itself. For example: 2² = 2 x 2 or 4. If we wrote 3³ we would mean 3 x 3 x 3, or 3 multiplied by itself three times. |