# How do you know when a radical is in simplest form?

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My answer: All and any perfect squares under the radical were identified, the sqrt has been taken out of each perfect square, and each root has been taken out from under the sqrt sign and written in front instead.

Is this correct?

My answer: All and any perfect squares under the radical were identified, the sqrt has been taken out of each perfect square, and each root has been taken out from under the sqrt sign and written in front instead.

Is this correct?

##### 1 Answer

#### Answer:

See explanation

#### Explanation:

Prime factors are the key

Considering just numbers.

Suppose we had had a square root and the number can be written as a product of primes. For example:

Then we have

The 3 inside the root can not be broken down any further into whole number factors. So that is the point you stop.

If you have a variable, for example

We can take the

However; if you had