irrational numbers and roots

Hi Ramza,

Not all roots require that the number be evenly divided into 4.  That is a specific case of roots called "The 4th root".  The basic principle of roots is the inverse of exponents.  Roots undo exponents.  Check out this video for more: https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:rational-exponents-radicals/x2f8bb11595b61c86:radicals/v/introduction-to-square-roots

For example, the square root (the most basic root) of 9 is 3.  3^2 = 9, and the square root will undo the exponent, in this case, 2.  So, when taking the square root of a number, ask, "what number times itself will equal this number?"  What number times itself twice will equal 9?  In this case, it's 3.  The video I think does a good job explaining the process, definitely check it out.

Hope this helps!  Let me know if you have any further questions.

Elijah