SOLUTION: Under what situation would one or more solutions of a rational equation be unacceptable?

Question 134931: Under what situation would one or more solutions of a rational equation be unacceptable?
Answer by vleith(2983) (Show Source): You can put this solution on YOUR website!
This applies often to problems in physics -- and in real life.
So let's say an expression is given as the model for something based in time. Example, the trajectory of a batted ball.
If the question asked "when will the ball hit the ground?" and one of the answer is -5 seconds. An answer that happens 'before the ball is hit', is a solution that is unacceptable.
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