However, there is no rational number x {\displaystyle x} such that f ( x ) = 0 {\displaystyle f(x)=0} , because 2 {\displaystyle {\sqrt {2}}} is an irrational number.
Međutim, ne postoji racionalni broj x takav da je f(x) = 0, jer je 2 {\displaystyle {\sqrt {2}}} iracionalan broj.