SOLUTION: Why isn't "c-1/5" the correct response to "Solve the equation c^2=1/25"?

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Question 873712: Why isn't "c-1/5" the correct response to "Solve the equation c^2=1/25"?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Do you mean c=1%2F5?
It is correct but incomplete.
c%5E2=1%2F25
c%5E2-1%2F25=0
The difference of two squares,
%28c-1%2F5%29%28c%2B1%2F5%29=0
There are two solutions.
c-1%2F5=0
c=1%2F5
and
c%2B1%2F5=0
c=-1%2F5