Radical 3 times radical 3 equals 3.
To explain this, we can use the properties of square roots and radicals. The square root of a number, like 3 (which is written as √3), represents a value that, when multiplied by itself, gives the original number. So, when we multiply √3 by itself, we are essentially calculating:
√3 × √3 = √{(3 × 3)} = √{9} = 3.
This shows that multiplying a radical by itself gives you the original number, provided that the number under the radical is non-negative. Therefore, radical 3 times radical 3 is simply 3.