There are many more than 2 ways:
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3 and -3
Several different ways in which the solution can be expressed. 2 √18 Take everything inside the square root. 2√18 = √(4 x 18) = √72 Simplify the square root. 2√18 = 2√(9 x 2) = 2 x 3√2 = 6√2 Solve the square root. 2√18 = 2 x 4.24264 = 8.48528 (5dp)
For right angled triangles it is the square root of square of side A added to square of side B (sorry i don't have a square sign on my keyboard) hypotenuse=square root of AxA+BxB
The square root of the number 855 may be approximated many different ways. The most straightforward way is to punch it into a calculator which will typically present it to 10 decimal places. In the absence of a calculator one may type it into Google to obtain 29.2403830344.
If you want a mathematical way to solve square roots that isn't trial and error, you probably need an algorithim. There are many ways to do this, and if you aren't satisfied with my way, or don't understand search for square root algorithims and you will find millions of ways.