Describe Square Roots?

When a number is written inside a radical sign (√), the number is called the radicand, and we say that you are "taking the square root of" that number.

radical sign →√9 = radicand
The expression √9 is read as "the square root of nine."
√4is read as "the square root of four."
√-4 is read as "the square root of negative four."
The square root of a number is a number which, when squared (that is, multiplied by itself), equals the original number.
Example 1:
42 = 16, so 4 is the square root of 16.
Example 2:
52 = 25, so 5 is the square root of 25.