I was working on a problem that was presented as 2x2- 10 = 0 I worked it out as such......

2x2 - 10 + 10 = 0 + 10
2x2 / 2 = 10/2

I came up with x2 = 5 now i think that the answer can also be in the form of x = +/- Sqr(5). Now do tests take into acount mathamatical problems that can have answers in multiple forms? Im sure that if a teacher was giving the test he would notice if an answer deviated from a standard form but what about other tests?