square roots can be positive or negative, correct ?

[bindhaas]

what's the answer for following DS
If m and v are integers, what is the value of m + v?

(1) mv = 6

(2) (m + v)^2 = 25

mine is E.

[vts_gmat]

mine too is "E"
Statement 1: m*v=6
implies: (+m)(+v)=+6 or (-m)(-v)=+6
statement 2: m+v=+/-5
implies: m=+/-3 or 2 & v=+/-2 or 3
Both together can not give correct answer, Hence, "E"

[StaceyKoprince]

Please cite the source of the question; instructors cannot answer until we know the source.