# How do you find the principal square root of 8?

##### 2 Answers

For a non-negative real number,

The symbol

Thw pricipal square root of

We do, however write

If, by "find" you mean get a decimal approximation, you could use: start with a number you know is close

divide

Average your previous estimate and the quotient:

Repeat:

Divide:

Average:

Repeat

Divide:

Average

If you need more accuracy, start again and keep more places when rounding.