Respuesta :

Answer:

2√5

Step-by-step explanation:

Use a factor tree to break down 20 into it's prime roots.

20 = 2 x 10

20 =  2 x 2 x 5

These are the prime factors of 20, so we can rewrite √20 as

(√2)(√2)(√5)

         (√2)(√2) = √(2x2) = √4 = 2, so we have

2√5