Same applies for the other way as well, if need be, though it is best to leave it in the simplest format as possible. The following are just for you to understand the relationship between square numbers and square roots.

**Example:**

Rewrite 2√2 as a single number under a square root.

**Worked Solution:**

Using the rule √ab≡√(a×b)≡ √a×√b and √s=n provided that n^{2}=s, then:

2√2=√4×√2=√(4×2)=√8

**Your turn:**

Rewrite 4√5 as a single number in the form √k.

Find the value of k.

Enter your answer here: