An extraneous solution is the root of a transformed equation that isn't the root of the original equation.
Your information is incomplete. Therefore, an overview will be given. It should be noted that an extraneous solution simply means a solution that is gotten from the solving of a problem but isn't a valid solution to the problem.
In order to find whether a solution is extraneous, you'll bed to plug it back into the equation and see if it works.
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