Posted by **becky** on Sunday, February 10, 2008 at 7:05pm.

When solving a rational equation, why is it necessary to perform a check?

- algebra -
**Damon**, Sunday, February 10, 2008 at 7:16pm
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.

- algebra -
**Guido**, Sunday, February 10, 2008 at 8:13pm
Basically to see if the value found for x will yield the same answer on both sides of the equation.

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