Determine O() Notation and where it comes from in function

Please refer to the code below. What is the o) notation for this code? What aspects of the code determine o )? x = 25 epsilon = 0.01 step = epsilon **2 numGuesses = 0 ans = 0.0 while (abs (ans*#2 - x)) >= epsilon and ans = epsilon: print('test failed') else: print'success, the answer you seek is: ', ans)