Posted by becky on Sunday, February 10, 2008 at 7:05pm.
If you mean something like
x^2 = 25
then x = +5 or x = -5
only one of the two solutions may solve your original problem. Therefore you try them both in the original problem that led to x^2 = 25 to see if one or the other or both works.
Basically to see if the value found for x will yield the same answer on both sides of the equation.
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