Basically, the square root of a number gives two root values, which is expressed as +ve and -ve symbol. "Note that any positive real number has two square roots, one positive and one negative. The square root of 9 is 3. To square a number: multiply it by itself. The Square Root of 9 - Root(9) - Root 9 - Sqrt(9) - Sqrt 9 - EXPLAINED - ✔ In this video, we.