√80 = √(4 * 20)
= √4 * √20
= 2 * √20
So, the square root of 80 is 2√20.
Next, let's simplify √20:
√20 = √(4 * 5)
= √4 * √5
= 2 * √5
Therefore, 2√20 becomes 2 * 2 * √5, which is equal to 4√5.
Finally, we have reduced the radical √80 to 4√5.